GB2550319A

GB2550319A - Air diffuser

Info

Publication number: GB2550319A
Application number: GB1604764.9A
Authority: GB
Inventors: Sarmad Amir
Original assignee: Aalmir Plastic Ind LLC
Current assignee: Aalmir Plastic Ind LLC
Priority date: 2016-03-21
Filing date: 2016-03-21
Publication date: 2017-11-22
Anticipated expiration: 2036-03-21
Also published as: GB201604764D0; GB2550319B

Abstract

An air diffuser for a heating, ventilation and/or air conditioning (HVAC) system comprises a frame 10 having a core receiving portion (12, fig 3A) formed through the frame and through which air can pass. An air guiding portion 14 guides air flowing through the core receiving portion. The diffuser comprises a removable core 20 that engages with the core receiving portion to allow air to be guided through the core receiving portion in cooperation with the air guiding portion. A snap lock 84 extends from and is integrally formed with the core and comprises a resilient elongate portion 86 with a protuberance 88 that engages with a snap lock engagement hole 82 formed in the core receiving portion so as to hold the core to the frame. The frame may comprise an arcuate portion (104, fig 23) that cooperates with an arcuate portion (106, fig 21) of the protuberance to flex the elongate portion away from the frame. A plurality of snap locks and corresponding snap lock engagement holes may be provided. A plurality of stand off seats 80 integrally formed with the core receiving portion align with a plurality of stand offs 90 integral with the core.

Description

AIR DIFFUSER

The present disclosure relates to an air diffuser.

Air diffusers are commonly used in heating, ventilating and air-conditioning (HVAC) systems, for example to deliver conditioned air and to help distribute the air evenly around a room. Air diffusers are typically manufactured from metal such as extruded aluminium, and are often powder coated so as to provide a desired visible appearance and achieve desired surface properties. However, this can often mean that air diffusers can have many manufacturing steps and volatile compounds released during the coating process can be difficult to process and be environmentally damaging. Additionally, those that have reached the end of their usable lifetime may be difficult to recycle. Furthermore, for example, aluminium processing tends to be very energy intensive, and mining of bauxite ore can be very environmentally damaging.

Air diffusers typically comprise a frame and a core, and sometimes include a removable core that allows easy access to an air control damper or the ducting behind the air diffuser. The removable core is often secured to the frame by a relatively complex spring loaded mechanism, or by a one or more screws fitting through the core to the frame. These can be fiddly for an installer or service agent to use, especially when working overhead and at height.

Examples of the present disclosure seek to address the above issues.

In an example of the disclosure, there is provided an air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising: a frame comprising a core receiving portion formed through the frame and through which air can pass, and an air guiding portion for guiding air flowing through the core receiving portion; a removable core arranged to engage with the core receiving portion so as to allow air to be guided through the core receiving portion in cooperation with the air guiding portion; and a snap lock extending from the core and integrally formed with the core, the snap lock comprising a resilient elongate portion, in which: a snap lock engagement hole is formed in the core receiving portion; and the snap lock comprises a protuberance that extends away from the elongate portion, the protuberance being capable of engaging with the snap lock engagement hole so as to hold the core to the frame.

In a further example of the disclosure, there is provided a removable core for an air diffuser of a heating, ventilation and/or air conditioning (HVAC) system, the core being capable of cooperating with a frame of the air diffuser so as to guide air through the air diffuser, the core comprising: a snap lock extending from the core and integrally formed with the core, the snap lock comprising a resilient elongate portion, in which: the snap lock comprises a protuberance that extends away from the elongate portion, the protuberance being capable of engaging with a snap lock engagement hole formed in the frame of the air diffuser so as to hold the core to the frame.

For example, the snap lock can be used so as to clip the core to the frame, but may also allow easy removal of the core from the frame, for example for servicing or maintenance. In other words, for example, the air diffuser of the present disclosure may help simplify removal and/or insertion of the core into the frame as well as helping to reduce manufacturing complexity.

In an example of the disclosure, there is provided an air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising: a frame comprising a core receiving portion formed through the frame and through which air can pass, and an air guiding portion for guiding air flowing through the core receiving portion; a core arranged to engage with the core receiving portion so as to allow air to be guided through the core receiving portion in cooperation with the air guiding portion; a plurality of stand offs integrally formed with the core; and a plurality of stand off seats integrally formed with the frame and arranged to cooperate with respective stand offs so as to align the core with respect to the core receiving portion.

For example, the stand offs can be thought of as guides that can guide the core into engagement with the frame. Additionally, for example, the stand offs can cooperate with the stand off seats so as to assist alignment of the core with respect to the frame so as to help improve airflow through the air diffuser because alignment between the air guiding portion and the core may be more consistent, especially if the core is removed and replaced for example during servicing of an HVAC system. Furthermore, for example, the stand offs may help to align the core with the frame such that a mechanism used to hold the core to the frame such as a snap lock can aligned more easily.

In an example of the disclosure, there is provided an air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising: a frame comprising a core receiving portion formed through the frame and through which air can pass, and an air guiding portion for guiding air flowing through the core receiving portion; a core arranged to engage with the core receiving portion so as to allow air to be guided through the core receiving portion in cooperation with the air guiding portion; and a filter arranged so as to allow air passing through the core receiving portion to be filtered.

Therefore, for example, air can be filtered by the air diffuser and a level of contaminants such as dust and dirt in the air reduced by the filter, such that contaminants are less likely to be re-circulated back into the building from the ducting or other components of the HVAC system, especially where dust, dirt, bacteria and other contaminants may have built up in ducting of an HVAC system, for example.

In another example of the present disclosure, there is provided a neck adapter for connecting an air diffuser to a duct of a heating, ventilation and/or air conditioning (HVAC) system, the neck adapter comprising: a first portion for connecting to the air diffuser, the first portion having a first size corresponding to a size of a duct to which the first portion can be connected; a second portion connected to the first portion, the second portion having a second size corresponding to a size of a duct to which the second portion can be connected; and a tear-away strip between the first portion and the second portion, in which: the tear-away strip can be torn away so that the second portion can be detached from the first portion.

Therefore, for example, by detaching or removing the tear away strip so that the second portion can be detached from the first portion, an installer can select a size of neck that corresponds to the size of ducting to which the adapter is to be connected. In other words, for example, the neck adapter of the disclosure can allow connection to different sizes of ducting without having to provide many different sizes of individual adapters.

In an example of the present disclosure, there is provided a damper for an air diffuser of a heating, ventilation and/or air conditioning (HVAC) system, the damper comprising: a hollow housing comprising a guide plate support ledge; a plurality of substantially laminar damper blades mounted within the housing across the inside of the housing, the damper blades each comprising pivot portions that pass through respective blade support holes formed in the wall of the housing, and the damper blades being rotatable about a longitudinal axis of the damper blades; and a guide plate mounted within the housing and arranged to cooperate with the damper blades so that linear movement of the guide plate with respect to the housing along the guide plate support ledge can cause the damper blades to rotate with respect to the housing, in which: the guide plate comprises a plurality of longitudinal slots formed in the guide plate, through which the pivot portions on one side of the housing pass so as to hold the guide plate between the damper blades and the housing.

Therefore, for example, the damper of the present disclosure helps improve smoothness of operation because the guide plate can slide along guide plate support ledge. Additionally, for example, the damper of the present disclosure can help improve ease of assembly of a damper because the guide plate is held between the damper blades and the housing and supported by the guide support ledge.

Aspects of the invention are defined in the appended claims.

Additionally, for example, the air diffuser and/or the damper can be moulded from plastics material, thus making recycling easier and helping to lower environmental effects caused by aluminium processing.

Examples of the disclosure will now be described by way of example only with reference to the accompanying drawings, throughout which like parts are referred to by like references and in which:

Figure 1 is a schematic front view of an air diffuser according to examples of the present disclosure;

Figure 2 is a schematic rear view of the air diffuser according to examples of the present disclosure;

Figures 3A and 3B are schematic cross-sectional views of the air diffuser shown in Figures 1 and 2 according to examples of the present disclosure;

Figures 4A and 4B are schematic side views of a frame of the air diffuser showing a latching clip according to examples of the present disclosure;

Figures 5A and 5B are schematic views of a latching clip according to examples of the present disclosure;

Figures 6A to 6C are schematic views of a latching element according to examples of the present disclosure;

Figures 7A to 7E are schematic views of a biasing element according to examples of the present disclosure;

Figures 8A and 8B are schematic views of a securing rod according to examples of the present disclosure;

Figures 9A to 9D schematically show the cooperation of the securing rod with the biasing element according to examples of the present disclosure;

Figures 10A to 10E schematically show operation of the latching clip according to examples of the present disclosure;

Figures 11A and 11B schematically show the frame of the air diffuser according to examples of the present disclosure;

Figures 12A and 12B schematically show plan views of a core of the air diffuser according to examples of the present disclosure;

Figures 13A and 13B schematically show cross sectional views of the core shown in Figures 12A and 12B according to examples of the present disclosure;

Figure 14 schematically show an isometric view of the rear of the frame of the air diffuser according to examples of the present disclosure;

Figures 15A and 15B schematically show cross sectional views of the frame jccording to examples of the present disclosure;

Figures 16A and 16B schematically show a stand off seat according to examples of the present disclosure;

Figure 17 schematically shows an isometric view of the rear of the core of the air diffuser according to examples of the present disclosure;

Figure 18 schematically shows an enlarged view of a stand off and a snap lock according to examples of the present disclosure;

Figures 19A and 19B schematically show cross sectional views of the core illustrated in Figure 17 according to examples of the present disclosure;

Figure 20 schematically shows a cross sectional view of a stand off and snap lock according to examples of the present disclosure;

Figures 21 schematically shows details of the stand off and snap lock according to examples of the present disclosure;

Figures 22A and 22B schematically show cooperation of a snap lock with the frame according to examples of the present disclosure;

Figure 23 schematically shows a cross sectional view of a stand off seat according to examples of the present disclosure;

Figure 24 schematically shows a neck adapter according to examples of the present disclosure;

Figure 25 schematically shows the neck adapter mounted on the frame according to examples of the present disclosure;

Figure 26 schematically shows the neck adapter together with a tear off strip according to examples of the present disclosure;

Figure 27 schematically shows the neck adapter together with snap locks for securing the adapter to the frame according to examples of the present disclosure;

Figure 28 schematically shows the frame and snap lock holes according to examples of the present disclosure;

Figure 29 schematically shows a cross sectional view of a tear away strip according to examples of the present disclosure;

Figure 30 schematically shows a rear view of a filter mounted in the frame according to examples of the present disclosure;

Figure 31 schematically shows a cross sectional view of the filter mounted in the air diffuser according to examples of the present disclosure;

Figure 32 schematically shows a front view of the filter mounted in the frame according to examples of the present disclosure;

Figure 33 schematically shows an enlarged partial view of the filter, the frame, and the core according to examples of the present disclosure;

Figures 34A and 34B schematically show isometric views of the filter according to examples of the present disclosure;

Figures 35A and 35B schematically show plan views of the filter according to examples of the present disclosure;

Figure 36 schematically shows a rear view of the air diffuser comprising a damper box according to examples of the present disclosure;

Figures 37A and 37B schematically show a guide plate together with a plurality of blades of a damper box according to examples of the present disclosure;

Figure 38 schematically shows the guide plate mounted in the frame according to examples of the present disclosure;

Figure 39 schematically shows the blades and guide plate mounted in the frame according to examples of the present disclosure;

Figure 40 schematically shows an isometric view of a guide plate according to examples of the present disclosure;

Figures 41A to 41D schematically show plan views of the guide plate according to examples of the present disclosure;

Figure 42 schematically shows a damper blade according to examples of the present disclosure; and

Figures 43A to 43D schematically show plan views of a damper blade according to examples of the present disclosure.

Figure 1 is a schematic front view of an air diffuser 1 according to examples of the present disclosure. In examples, the air diffuser 1 is intended to be used with a heating, ventilation, and/or air conditioning (HVAC). However, it will be appreciated that it may be used in other circumstances where a fluid, such as air or other gas, may need to be guided from a duct for example to a volume through the air diffuser 1, or from a volume to a duct. Here, for example, fluid can include gas or liquid, although it will be appreciated that the examples of the present disclosure may more typically be used with a gas such as air. It will also be appreciated that where a gas is referred to for example, this may include a suspension of liquid or solid particles in the gas such as a colloid.

In the example shown in Figure 1, the air diffuser comprises a frame 10 (indicated with diagonal shading) and a core 20 (unshaded). In examples, the frame 10 and the core 20 cooperate together to guide a gas or fluid, such as air, through the air diffuser as part of an HVAC system. The air diffuser 1 may typically be ceiling mounted in a suitable cut out, for example in a ceiling panel, although it will be appreciated that other mounting systems could be used. In examples, the core 20 is removable from the frame 10, for example to allow for access to a duct or damper of the HVAC system. In examples, the core 20 is removable from the frame 10, although it will be appreciated that the core 20 could be non-removable, for example by fixing it in place with adhesive, or forming it as one piece with the frame. In examples, one or more of frame 10 and the core 20 comprises plastics material such as Acrylonitrile butadiene styrene (ABS) or polycarbonate (PC) although it will be appreciated that other plastics materials could be used. Additionally, for example, it will be appreciated that recycled plastics materials could be used. A way in which the core 20 is held to the frame 10 will be described in more detail later below.

In examples, one or more of the frame 10 and the core 20 comprises plastics material. In examples, the frame 10 is integrally formed. In other words, for example, the frame 10 is formed or moulded as one piece. In examples, the core 20 is integrally formed. More generally, in the present disclosure, integrally formed is taken to mean, for example, moulded as one piece, or formed as one piece, such as being made from the same material in a mould. In examples, plastics material is used for the frame 10 and the core 20, although it will be appreciated that other materials could be used. Additionally, it will be appreciated that the frame 10 and core 20 need not be integrally formed and could be formed of more than one piece.

Figure 2 is a schematic rear view of the air diffuser according to examples of the present disclosure. In examples, the air diffuser 1 comprises a latching clip 30. The latching clip 30, can be used to hold the air diffuser onto a object to which it is to be mounted. For example, the latching clip 30 can help hold the air diffuser 1 in a ceiling panel as part of an HVAC system. In the example shown in Figure 2, there are two latching clips 30, although it will be appreciated that the latching clips 30 could be omitted, for example if another way of holding the air diffuser 1 to a mounting position is provided. Additionally, it will be appreciated that one latching clip 30 could be used, with suitable modifications to the air diffuser, or that more than two latching clips 30 could be used. The operation of the latching clip 30 will be described in more detail later below.

Figures 3A and 3B are schematic cross-sectional views of the air diffuser 1 according to examples of the present disclosure. In particular, a relationship between the cross sectional view shown in Figure 3A and the cross sectional view shown in Figure 3B is as if the air diffuser had been rotated through ninety degrees in the plane of a front face 16 of the air diffuser 1 such as that presented in Figure 1.

In examples, the frame 10 comprises a core receiving portion 12 formed through the frame 10 and through which air can pass. In examples, the frame 10 comprises an air guiding portion 14 for guiding air flowing through the core receiving portion 12. In examples, the core 20 is arranged to engage with the core receiving portion 12 so as to allow air to be guided through the core receiving portion 12 in cooperation with the air guiding portion 14. In examples, the core 20 comprises a plurality of louvered slats 22 for guiding air through the core receiving portion 12. As mentioned above, in examples, the core 20 and the frame 10 cooperate together so that air can be guided through the air diffuser 1 as indicated by the dashed lines and arrows in Figures 3A and 3B. In particular, in the examples shown in Figures 3A and 3B, air may be guided as indicated by the dashed lines and arrows between the louvered slats 22 and the air guiding portion 14.

In examples, the air diffuser 1 comprises a damper box 400, for example for controlling the flow rate through the air diffuser 1, and/or for helping to reduce noise from a duct to which the air diffuser 1 may be connected. The damper box 400 will be described in more detail later below. A latching clip according to examples of the disclosure will now be described with reference to Figures 4 to 10. In particular, Figures 4A and 4B are schematic side views of a frame of the air diffuser showing a latching clip 30 according to examples of the present disclosure and Figures 5A and 5B are schematic views of the latching clip 30 according to examples of the present disclosure. The side view shown in Figure 4A is shown rotated ninety degrees with respect to the side view shown in Figure 4B when rotated in the plane of the front face 16 of the air diffuser 1.

Referring to Figures 4A, 4B, 5A, and 5B, in examples, the latching clip 30 comprises a frame 10. In examples, the frame 10 comprises a hinge portion 32 and a latch stop portion 34. In examples, the hinge portion 32 and the latch stop portion 34 are integrally formed with the frame. In other words, in examples, the latch stop portion 34 and the hinge portion 32 are formed as one piece with the frame 10. This may help simplify manufacture and help reduce cost.

In examples, the frame 10 comprises a lip 18 arranged along an edge of the frame 10. For example, the lip 18 can be integrally formed with the frame. In examples, the lip 18 extends away from the frame and away from the front face 16. This may help improve the stiffness of the frame at the edge of the frame. However, it will be appreciated that the lip 18 could be coplanar with the front face 16 of the frame 10 and that other arrangements are also possible as will be appreciated by the skilled person. In examples, the latching clip comprises the whole frame 10 but it will be appreciated that any frame comprising a lip arranged along an edge of the frame could be used. It will also be appreciated that the edge of the frame could act as a lip and that the lip need not be a separately distinguishable feature from the frame.

In examples, the latching clip 30 comprises a latching element 36 having a first portion 38 and a second portion 40. In examples, the latching element 36 is hinged to the frame 10 by a hinge 42 at the hinge portion 32, the hinge 42 being located between the first portion 38 and the second portion 40. In examples, the latching element 36 extends longitudinally in a direction substantially parallel to the axis of the hinge 42. In other words, for example, the latching element 36 is substantially elongate.

In examples, the latching clip 30 comprises a substantially planar biasing element 44 arranged between the frame 10 and the latching element 30 so as to connect the frame 10 to the latching element 30. In examples, the latching element 30 is movable between a first position at which the first portion 38 of the latching element 36 is urged towards the latch stop region 34 by the biasing element 44, and a second position at which the first portion 38 of the latching element 36 is urged towards the lip 18 by the biasing element 44. In the example shown in Figure 4B, the latching clip 30 on the left of the drawing is shown in the first position, and the latching clip 30 on the right of the drawing is shown in the second position. Referring to the example of Figure 5A, the latching element 36 is shown in the second position. Referring to the example of Figure 5B, the latching element 36 is shown in the first position.

In examples, the latching element 36 and the biasing element are arranged so that the latching element 36 can move about the axis of the hinge 42 from the first position to the second position in response to movement of the second portion 40 towards the lip 18. Therefore, the latching clip according to examples of the disclosure. can, for example, help with mounting an object such as the air diffuser 1 to a suitable cutout.

For example, an installer may position the latching clips 30 of the air diffuser in the first position such that the latching element 36 is urged towards the latch stop region 34 by the biasing element 44. In other words, for example, the latching clip 30 can thought of as being held open in the first position. The installer may then position the air diffuser 1 to be offered up to a suitable cut out in a ceiling panel where it may be connected to ducting for an HVAC system. By pushing the air diffuser 1 into the ceiling cutout, the installer can cause the second portion 40 of the latching element 36 to contact an edge of the ceiling panel, for example causing the second portion to move in a direction indicated by arrow 46 in Figures 4B and 5B. This can cause the latching element to move from the first position to the second position where the first portion 38 is urged towards the lip 18 of the frame 10. In other words, for example, this can cause the latching clip to move to a closed position where the latching clip 30 or latching clips 30 hold the air diffuser in the ceiling panel cutout. For example, a portion of a ceiling panel may be held between the first portion 38 and the lip 18 so that the air diffuser 1 is supported within the cutout.

More generally, for example, the second position can be thought of as a closed position. Flowever, it will be appreciated that ceiling panels may have different thicknesses. The latching clip of examples of the present disclosure may allow different thicknesses to be taken into account because the first portion is urged towards the lip 18 by the biasing element 44. Therefore, for example, installation can be simplified because the latching clip 30 may automatically move from the first position to the second position in response to the air diffuser 1 being pushed into a suitable cutout.

If, for example, the air diffuser needs to be removed, such as for servicing or duct maintenance, an operator can pull on the air diffuser so that the first portion 38 is pressed against an edge of the ceiling panel cutout. The latching clip 30 may, for example, move from the second position to the first position so that the clip 30 is held open and so the air diffuser 1 may quickly and easily be removed from the cutout. Accordingly, examples of the disclosure can help improve installation or maintenance time as well as helping to simplify installation and maintenance.

In examples, the resilient biasing element 44 comprises an elastomer. However, in other examples, the resilient biasing element 44 comprises rubber. Additionally, it will be appreciated that a combination of elastomer and rubber could be used. It will also be appreciated that any other suitable material suitable for use as a resilient biasing element could be used such as those having a natural length, and those which exert a restoring force back to the natural length when the biasing element is stretched away from the natural length.

In examples, the biasing element comprises thermoplastic vulcanizate (TPV) elastomer, although other materials such as thermoplastic elastomer (TPE), thermoplastic polyurethanes (TPU), rubber (natural), engineering polymer blends (EPB), ethylene propylene diene monomer (EPDM) elastomers, styrene butadiene rubber (SBR), and nitrile rubber may be used, although it will also be appreciated that other types of material could be used.

Figures 6A to 6C are schematic views of a latching element according to examples of the present disclosure. In examples, the latching element 36 comprises a trunnion 50. Referring back to Figures 4B, 5A and 5B, in examples, the hinge portion 32 comprises a trunnion seat 48 arranged to cooperate with the trunnion 50 so that the latching element can pivot about the axis of the hinge 42. In other words, for example, the trunnion 50 and trunnion seat 48 can be thought of as acting as a hinge. For example, a trunnion can be thought of as a cylindrical protrusion or projection that can act as a pivot point or as part of a hinge, for example to support the latching element 36 on the hinge portion 32. For example, the trunnion seat 48 can be thought of as being able to support the trunnion 50 so they can cooperate together to act as a hinge.

More generally, for example, the hinge 42 can be thought of as comprising the trunnion 50. In examples, the trunnion seat 48 is open and the biasing element 44 is arranged so as to urge the trunnion 50 into the trunnion seat 48. This can help simplify and speed up assembly of the latching clip 30 as will be discussed in more detail later below.

In examples, a pair of trunnions 50 is located either side of the latching element 36, for example as shown in Figures 6A and 6B. However, it will be appreciated that a continuous trunnion could be used that corresponds to the length of the latching clip 36 or that other suitable numbers of trunnions could be used. It will also be appreciated that the hinge 42 could comprise other hinge mechanisms such as a pin and hole hinge, although any type of suitable hinge could be used.

In examples, the first portion 38 is longer than the second portion 40. For example, an edge of the first portion 38 is located further from the hinge 42 than an edge of the second portion 40. In examples, the first portion 38 extends away from the hinge 42 and the second portion 40 extends away from the hinge 42. In examples, the latching element 36 extends longitudinally in a direction substantially parallel to the axis of the hinge 42. In examples, the latching element 36 has a generally c-shaped cross section although it will be appreciated that the latching element 36 could have other suitable cross sections and that the cross section need not be continuous or the same, for example in the direction along the axis of the hinge 42.

In examples, the latching element 36 comprises a pair of rod securing hooks 52. In examples, the rod securing hooks 52 cooperate with a securing rod to help secure the latching element 36 to the frame 10 as will be described in more detail later below.

Figures 7A to 7E are schematic views of a biasing element according to examples of the present disclosure and Figures 8A and 8B are schematic views of a securing rod according to examples of the present disclosure. In particular, for example. Figure 7A is a schematic isometric view of the biasing element 44, Figure 7B is a schematic front view of the biasing element 44, Figure 7C is a schematic side view of the biasing element 44, Figure 7D is a schematic top view of the biasing element 44, and Figure 7E is a schematic back view of the biasing element 44.

In examples, the biasing element 44 comprises a first end 54 for securing the biasing element 44 to the frame 10, in which a first loop 56 is formed in the first end 54. In examples, the biasing element 44 comprises a second end 58 for securing the biasing element 44 to the latching element 36, in which a second loop 60 is formed in the second end 58. In examples, the biasing element can be thought of as a substantially rectangular sheet through which perforations are formed, with the first end 54 corresponding to a bottom edge of the sheet and the second end 58 corresponding to a top edge of the sheet. For example, an end such as the first end 54 and the second end 58 can be considered to be in a plane corresponding to a cross section through the sheet of the biasing element.

Figure 8A is a schematic isometric view of a first securing rod 62 and Figure 8B is a schematic plan view of a second securing rod 64 according to examples of the disclosure. In examples, the latching clip 30 comprises the first securing rod 62 and the first securing rod 62 is arranged to cooperate with the first loop 56 so as to secure the first end 54 of the biasing element 44 to the frame 10. Figures 9A to 9D schematically show the cooperation of the securing rods 62 and 64 with the biasing element 44 according to examples of the present disclosure. In particular, the first securing rod 62 is shown located through the first loop 56 formed in the first end 54, and the second securing rod 64 is shown located through the second loop 60 formed in the second end 58.

In other words, more generally, in examples the latching clip 30 comprises a second securing rod 64 arranged to cooperate with the second loop 60 so as to secure the second end 58 of the biasing element 44 to the latching element 36. In examples, the first securing rod 62 has a different length from the second securing rod 64, although it will be appreciated that the could have the same length as each other.

In order to help secure the first end 54 of the biasing element 44 to the frame 10, in examples the frame 10 comprises a first pair of rod securing hooks 66, for example as shown in Figure 5B (and for example in Figure 11B). In examples, the first securing rod 62 is arranged to pass through the first loop 56 of the biasing element 44 and cooperate with the first pair of rod securing hooks 66 so as to hold the first securing rod 62 in the first pair of rod securing hooks 66.

As mentioned above, in examples, the latching clip 30 comprises a second pair of rod securing hooks. In particular, in examples the latching element 36 comprises a pair of securing hooks 52, for example as shown in Figures 6A and 6B. In examples, the second securing rod 64 is arranged to pass through the second loop 60 of the biasing element 44 and cooperate with the second pair of rod securing hooks 52 so as to hold the second securing rod 64 in the second pair of rod securing hooks 52.

In other words for example, the latching element 36 is secured or held to the frame 10 by tension in the biasing element which pulls the latching element 36 towards the frame 10. As mentioned above, in examples, the biasing element 44 is arranged to urge the trunnion 50 into the trunnion seat 48.

Although in examples the biasing element 44 has a loop formed at each end (such as the first end 54 and the second end 58) it will be appreciated that the biasing element could be fixed to the frame 10 and latching element 36 in other suitable manners. For example, the biasing element 44 may have one or more loops formed in at least one of the ends. In other words, more generally for example, the latching clip 30 comprises a securing rod 62, 64 arranged to cooperate with the loop 56, 60 so as to secure the biasing element 44 to at least one of the frame 10 and the latching element 36.

In examples, cutouts 68 are formed in the biasing element 44 to allow the securing hooks 52 and 66 to engage with the respective securing rods 62 and 64. In examples, the length of the first securing rod 62 is such that it can fit between the hinge portions 32 of the frame 10. Although pairs of rod securing hooks 52 and 66 have been described, it will be appreciated that any suitable number of rod securing hooks could be used so as to secure the latching clip 36 to the frame 10.

As shown in Figures 7 and 9, in examples, the resilient biasing element 44 is perforated. In other words, in examples, holes (such as perforations 70) are formed in the resilient biasing element 44. For example if the biasing element 44 is made from a moulded sheet material such as moulded elastomer, the spring constant of the biasing element 44 can be tuned by adjusting the size of the perforations in the design before the biasing element is moulded. This may also mean that if the material of the biasing element degrades over time, such as might occur over a relatively long lifetime of a HVAC system such as ten years, then degradation in the material and possible breakage may be isolated from other parts of the biasing element 44 by the perforations. Therefore, degradation of the biasing element 44 material is less likely to effect the holding strength of the latching clip over time and so may lead to a more reliable latching clip 30.

The latching clip 30 of the examples of the present disclosure may help simplify and speed up manufacture. A method of assembling the latching clip according to examples of the disclosure will now be described. In examples, the latching clip 30 comprises a biasing element assembly 65 in which the first securing rod 62 is located within the first loop 54 and the second securing rod 64 is located within the second loop 58 (for example corresponding to the arrangement shown in Figures 9A to 9D). To arrive at the biasing element assembly 65, in examples, the securing rods 62 and 64 are inserted into the loops 56 and 60 formed in the biasing element 44 as shown in Figures 9A to 9D.

In examples, the second securing rod 64 is inserted through the second loop 60 and arranged so that the second rod securing hooks 52 of the latching element 36 engage with the second securing rod 64. For example, the first securing rod 62 is then inserted into the first loop 56, although it will be appreciated that the order in which the first securing rod 62 and second securing rod 64 are inserted into the respective loops 56 and 60 could be carried out in any order, such as reversed, or they could be inserted at substantially the same time.

In other examples, the securing rods 62 and 64 are over moulded with the biasing element 44. In other words, for example, the biasing element 44 can be moulded around or over the first securing rod 62 and the second securing rod 64, for example so as to arrive at the assembly shown in Figures 9A to 9D. In examples, the securing rods 62 and 64 are formed using a first mould, for example from plastics material. In examples, a second mould into which the securing rods 62 and 64 are placed is then used to mould the biasing element 44 over the securing rods 62 and 64.

In examples, once the first securing rod 62 and the second securing rod 64 are positioned in the loop 56 and 60 of the biasing element 44, and the second securing rod 64 arranged so as to engage with the hooks 52 of the latching element 36, the latching element 36 can be positioned so that the trunnions 50 engage with the trunnion seats 48 of the hinge portion 32. In examples, the biasing element 44 is then stretched from its natural length so that the first securing rod 62 can engage with the hooks 66 of the frame 10. The latching element 36 is then biased towards the frame 10 by tension in the biasing element, for example. In other words for example, the biasing element is arranged to urge the trunnions 50 into the trunnion seats 48 and connect the latching element 36 to the frame 10 so as to hold the latching element 36 to the frame 10.

In other examples, the biasing element assembly 65 is inserted into the latching element 36 so that the second securing rod 64 engages with the hooks 52 of the latching clip 36. In examples, the first securing rod 62 is then positioned so as to engage with the hooks 66 of the frame 10. In examples, the biasing element can then be stretched so that the trunnions 50 can engage with the trunnion seats 48 and so that the biasing element can cause the trunnions 50 into the trunnion seats 48.

Therefore, examples of the disclosure may help simplify the assembly of a latching clip 30 according to the disclosure by helping to reduce the complexity of a latching clip and reduce the number of steps needed to assemble a latching clip. This may, for example, also help to reduce manufacturing costs.

In examples, the latching clip 30 comprises plastics material such as Acrylonitrile butadiene styrene (ABS) or polycarbonate (PC) although it will be appreciated that other plastics materials could be used. In examples, the latching element 36 is integrally formed, in other words for example, it can be moulded as one piece.

Referring back to Figures 4 and 5, in examples, the first portion 38 extends in the direction of the plane of the lip 18 when the latching element 36 is in the second position so that the end of the first portion 38 coincides with an edge of the lip 18. This may help if the air diffuser 1 needs to be removed for example for maintenance because the latching element 36 may more easily move to the first position so as to latch open.

In other examples, the first portion 38 extends beyond the lip 18 in the direction of the plane of the lip when the latching element is in the second position. This may help provide a more secure hold because the overlap between the first portion 38 and a ceiling panel into which the air diffuser 1 may be mounted can be made greater. In examples, the plane of the lip can be considered to be parallel to the plane of the front face 16 of the air diffuser 1, although it will be appreciated that where the latching clip 30 is to be used with other objects, then the arrangement may be different. More generally, in some examples, the first portion 38 extends beyond the edge of the lip 18 when the clip 30 is in the closed position.

Figures 10A to 10E schematically show operation of the latching clip according to examples of the present disclosure. In particular, for example. Figures 10A to 10D schematically show the latching element 36 in the second position, and Figure 10E schematically shows the latching element 36 in the first position. In the examples shown in Figures 10A to 10E, a cross sectional view of a plane perpendicular to the axis of the hinge 42 is shown. In the examples of the Figures 10A to 10E, the views on the left of the Figures schematically illustrate an angular position of the latching element 36 with respect to the front face 16 of the air diffuser 1, the views labeled “X” schematically show the angular position and length of the biasing element 44, and the views labeled Ύ” schematically show the natural length of the biasing element 44.

In examples, the angular position of the latching element 36 is given by the angle between a line passing through the centre of the first loop 56 and second loop 60 of the biasing element 44 and a line parallel to the front face 16 of the air diffuser 1. For example in Figure 10A, the angle between line 72, which passes through the loops 56 and 60 of the biasing element 44, and line 74, which is parallel to the front face 16 is angle 76a. In Figure 10B, for example, the angle between line 72 and line 74 is angle 76b. In Figure IOC, for example, the angle between line 72 and line 74 is angle 76c. In Figure 10D, for example, the angle between line 72 and line 74 is angle 76d. In Figure 10E, for example, the angle between line 72 and line 74 is angle 76e.

In examples, angle 76a is 27 degrees, angle 76b is 34 degrees, angle 76c is 61 degrees, angle 76d is ninety degrees, and angle 76e is 107e. Flowever, it will be appreciated that these are merely illustrative examples of angles and that other angles are possible.

As mentioned above, in examples. Figures 10A to 10D illustrate the second position, where the latching element 36 is urged towards the lip 18 by the biasing element 44. Figure 10E shows an example of where the latching element 36 is in the second position such that the latching element 36 is urged towards the latch stop 34 by the biasing element 44. In other words, in examples, the transition from the first position to the second position can occur where the angle between the lines 72 and 74 is ninety degrees.

For example, the first position corresponds to the angle being greater than ninety degrees, and the second position corresponds to the angle being the same or less than ninety degrees. In examples, the closed position can be thought of as corresponding to the second position. However, it will be appreciated that in some examples, the latching clip 30 could be considered to be closed when the first portion 38 is in contact with a surface that restricts motion towards the lip 18, such as when it contacts the lip 18 or when the first portion 38 contacts a ceiling panel and the ceiling panel is held between the first portion and the lip 18. In examples, the latch stop 34 is arranged to restrict movement of the first portion 38 away from the lip 18.

For example, if the latching element 36 is in the first position (for example as shown in Figure 10E), movement of the second portion 40 towards the lip 18 (for example as indicated by arrow 46) will cause the latching element 36 to rotate about the hinge 42. However, the first portion 38 will be urged towards the latch stop 34 until the angle 76 is the same or less than ninety degrees, at which point the first portion 38 will be urged towards the lip 18. Therefore, for example, the distance that the second portion 40 has to move towards the lip 18 from a position at which the first portion 38 is in contact with the latch stop 34 will depend on the geometry and dimensions of the latching element. These can be chosen as desired so as to achieve the desired holding force for the first position for which the latching element 38 contacts the latch stop 34, or the desired holding force for the second position or closed position. Additionally, the length of the second portion 40 can be chosen to achieve a desired actuating distance over which the second portion 40 can be moved so as cause the change from the first position to the second position.

More generally, in examples, an air diffuser, such as air diffuser 1, comprises a latching clip (such as latching clip 30) according to examples of the disclosure. In examples, an air diffuser, such as air diffuser 1, comprises a pair of latching clips (such as latching clips 30), in which the pair of latching clips are arranged on opposite sides of the air diffuser to each other. This may help support the air diffuser when, for example, it is mounted in a suitable ceiling cutout of a ceiling panel. However, it will be appreciated that one or more latching clips could be used. However, it will be appreciated that the use of the latching clip or latching clips according to the present disclosure need not be limited to use with air diffusers. For example, the latching clip of the present disclosure could be used to help hold any suitable object to a suitable panel or surface.

The cooperation of the frame 10 with the core 20 will now be described in more detail. Figures 11A and 11B schematically show the frame 10 of the air diffuser 1 according to examples of the present disclosure. In examples, the frame 10 comprises a plurality of stand off seats integrally formed with the frame 10. For example, the stand off seats are used to align the core 20 with the frame 10 as will be described in more detail later below. In examples, snap lock engagement holes 82 are formed in the core receiving portion 12 of the frame 10 for engaging with snap locks of the core 20 so as to hold the core 20 to the 10. In examples, the frame 10 comprises a guide plate support ledge 510 as will described in more details later below.

Figures 12A and 12B schematically show plan views of a core of the air diffuser according to examples of the present disclosure, and Figures 13A and 13B schematically show cross sectional views of the core shown in Figures 12A and 12B. In particular, for example. Figure 12A shows a rear view of the core 20 and Figure 12B shows a front view of the core 20. Figure 13A shows a cross sectional view through section A-A indicated in Figure 12A, and Figure 13B shows a cross sectional view through section B-B indicated in Figure 12A.

In examples, the core 20 comprises a snap lock 84 which is integrally formed with the core 20. More generally, in examples, the air diffuser 1 can be thought of as comprising a snap lock, such as snap lock 84. In examples, the snap lock 84 comprises a resilient elongate portion 86. In examples, the snap lock comprises a protuberance 88 that extends away from the elongate portion 86. In examples, the protuberance 88 is capable of engaging with the snap lock engagement hole 82 so as to hold the core 20 to the frame. For example, the snap lock 84 can be used so as to clip the core 20 to the frame 10, but may also allow easy removal of the core 20 from the frame 10, for example for servicing or maintenance.

In examples, a plurality of stand offs 90 are integrally formed with the core 20. The plurality of stand off seats 80 are arranged to cooperate with respective stand offs 90 so as to align the core 20 with respect to the core receiving portion 12. In other words, for example, the stand offs 90 can be thought of as guides that can guide the core 20 into engagement with the frame 10.

For example, this may assist installation of the core 20 to the frame 10 because the stand offs 90 can for example slot into the stand off seats 80 of the frame 10 and therefore help assist with aligning the snap locks 84 with the snap lock engagement holes 82. More generally for example, the stand offs 90 can cooperate with the stand off seats 80 so as to assist alignment of the core 20 with respect to the frame 10 so as to help improve airflow through the air diffuser because alignment between the air guiding portion and the core may be more consistent, especially if the core 20 is removed and replaced for example during servicing of an HVAC system.

Figure 14 schematically show an isometric view of the rear of the frame 10 of the air diffuser 1 and Figures 15A and 15B schematically show cross sectional views of the frame 10. Figures 16A and 16B schematically shows a stand off seat 80. In examples, the stand off seat 80 comprises side walls 92 and a base wall 94. In examples, the side walls 92 and the base wall 94 are substantially perpendicular to an inward face 96 of the core receiving portion 12. In other words, in examples, the stand off seats 80 extend away from the core receiving portion 12. In examples, the side walls 92 are formed with the base wall 94 so as to have a curved portion where the side walls 92 join the base wall 94, for example as indicated by dashed line 95 in Figure 16B. In examples, the stand off seat 80 comprises a filter support portion 97 for supporting a filter in the frame as will be described in more detail later below. In other words, for example, the filter support portion 97 can act as a filter location stop.

For example, the side walls 92 can assist with aligning the core 20 with respect to the plane of the front face 16, and the base wall 94 can assist with aligning the core 20 with respect the core receiving portion in a direction perpendicular to the front face 16, for example along a longitudinal axis 98 of the frame 10. For example, the stand off 90 can contact the inner faces of the side walls 92 and the base wall 94 of the stand off seat 80 so as to position the core 20 in alignment with the frame 10. In other words, for example, the stands off 90 can be thought of as spacers, and the stand off seats 80 can be thought of as spacer seats. More generally, for example, the stand offs 90 (spacers) can be thought of as guides.

Therefore, in examples, the frame 10 comprises a plurality of spacer seats (such as stand off seats 80) integrally formed with the core receiving portion 12. In examples, the core 20 comprises a plurality of spacers (such as stand offs 90) that extend away from the core 20, the spacers being capable of cooperating with the spacer seats so as to align the core 20 with respect to the core receiving portion 12. In examples, the spacers are integrally formed with the core 20.

In examples, the stand off seats 80 are arranged on opposite sides of the core receiving portion 12 to each other. For example, referring to Figure 15A, the stand off seats 80 as shown to face each other and are on opposite sides of the frame 10 in the core receiving portion 12.

Figure 17 schematically shows an isometric view of the rear of the core 20 of the air diffuser 1, Figure 18 schematically shows an enlarged view of a stand off 90 and a snap lock 84, Figures 19A and 19B schematically show cross sectional views of the core 20 illustrated in Figure 17, and Figure 20 schematically shows a cross sectional view of a stand off 90 and snap lock 84, all according to examples of the disclosure. In examples, the stand offs 90 extend away from the core 20. In examples, the stand offs 90 (guides) are integrally formed with the core 20. In examples, the stand offs 90 are substantially laminar. In other words, in examples, the stand offs 90 have substantially parallel sides 102. For example, this allows the stand offs 90 to slide smoothly in and/or out of the stand off seats 80 and so help align the core 20 with the frame 10.

In examples, the stand offs 90 are fixedly held to the stand off seats by an interference fit, for example so that the stand offs 90 are held in the stand off seats 80 by friction. In some of these examples, the sides 102 of the stand offs 90 may not be parallel and are tapered towards the end of the stand off 90. In other examples, the width of the stand off 90 (for example the distance between the sides 102) may be the same as, or slightly greater than the distance between the side walls 92 of the stand off seats 80. In these examples, some degree of material elasticity may be required so that the stand off 90 and stand off seat 80 can deform to allow them to couple together by friction.

In some examples, the snap locks 84 may be omitted, for example to reduce cost, although it will be appreciated that the snap locks could also be used as appropriate depending on the application. If the snap locks 84 are omitted, the frame 10 may be manufactured without snap lock engagement holes 82, although it will be appreciated that a frame 10 with snap lock engagement holes 82 could be used with a core 20 that does not comprise the snap locks 84. In these examples, the interference fit between the stand offs 90 and the stand off seats 80 can be used to hold the core 20 to the frame 10, whilst still allowing the core to be removable.

In other examples, the standoffs 90 are fixedly held to the standoff seats 80 by an adhesive. This may help prevent unauthorised tampering of the HVAC system. However, if regular removal of the core 20 from the frame 10 is required, such as for maintenance, then the adhesive may be omitted.

Figures 21 schematically shows details of the stand off 90 and snap lock 84, Figures 22A and 22B schematically show cooperation of a snap lock 84 with the frame 10 according to examples of the present disclosure, and Figure 23 schematically shows a cross sectional view of at stand off seat 80 according to examples of the present disclosure.

Referring to Figures 22A and 22B, in examples, when the core 20 is held to the frame 10 by the snap lock 84, the elongate portion 86 is biased towards the frame 10 so that the protuberance 88 is pushed towards the snap lock engagement hole 82. In other words, for example, from a position where the core 20 and the frame 10 are not engaged with each other, movement of the core 20 towards the frame 10 can cause the snap lock 84 to contact the air guiding portion 12 and deflect away from the frame 10 so that the snap lock 84 can slide within the core receiving portion 12 and engage with the snap lock engagement hole 82 so as to hold the core 20 to the frame 10.

Referring to Figure 23, in examples, the frame 10 comprises a frame arcuate portion 104 between the air guiding portion 14 and the core receiving portion 12. Referring to Figure 21, in examples, the protuberance 88 comprises a snap lock arcuate portion 106 capable of cooperating with the frame arcuate portion 104 so as to flex the elongate portion 86 away from the frame 10. For example, if the core 20 is not mounted to the frame 10 and the core 20 is pushed towards the frame such that the stand offs 90 align with the stand off seats 80, the snap lock arcuate portion 106 of the snap lock 84 will contact the frame arcuate portion 104.

For example, a force in the longitudinal direction of the frame (see for example, Figures 15A and 15B) will cause the elongate portion 86 (and hence the snap lock 84) to flex or bend away from the frame 10 allowing the core 20 to slide with respect to the frame 10. In examples, once the protuberance 88 reaches the snap lock engagement hole 82, the resilient bias of the elongate portion 86 is such that the protuberance 88 is pushed into the hole 82, snapping it into place. Here, for example, arcuate is taken to mean curved.

In examples, a radius of curvature of the frame arcuate portion 104 is substantially the same as a radius of curvature of the snap lock arcuate portion 106. This may help to improve how smoothly the snap lock 84 operates when engaging with the frame 10.

In examples, a stand off distance 107 that the stand offs 90 extend away from a front face 105 of the core 20 is greater that a snap lock distance 109 that the snap locks 84. Therefore, in examples, from a position in which the core 20 is not engaged with the frame 10, movement of the core 20 towards the frame 10 in the longitudinal direction can cause the stand offs 90 to engage with the stand off seats 80 before the snap locks 84 contact the frame 10. In other words, for example, the stand offs 90 can cooperate with the stand off seats 80 so as to help guide the snap locks 84 towards the snap lock engagement holes 82. Therefore, for example, the guides (stand offs 90) can help align the core 20 with the frame 10 so that the snap locks 84 can engage with the frame 10 more easily. This may, for example, help in installation and/or maintenance especially if the user is working at height or above their head, because a user may easily be able to locate the stand offs 90 into the stand offs seats 80 and hence the snap locks 84 can then be correctly aligned with the snap lock engagement holes 82.

Although in examples, the operation of one snap lock 84 has been described, it will be appreciated that one or more snap locks 84 could be used to hold the core 20 to the frame 10. In other words, in examples, the air diffuser 1 comprises a plurality of snap locks 84 each extending from the core 20 and integrally formed with the core 20, each snap lock comprising a resilient elongate portion 86. In examples, a plurality of snap lock engagement holes 82 are formed in the core receiving portion 12. In examples, each snap lock 84 comprises a protuberance 88 that extends away from the elongate portion 86, and the protuberances 88 are capable of engaging with corresponding snap lock engagement holes so as to hold the core 20 to the frame 10. In examples, one or more pairs of snap locks 84 are located on opposite sides of the core 20.

For example, referring to the example of Figure 19B, a pair of snap locks 84 are located on opposite sides of the core 20 to each other. Referring to the example shown in Figure 19A, a snap lock 84a of a first pair of snap locks, and a snap lock 84b of a second pair of snap locks is schematically illustrated. In other words, in examples, the core 20 comprises four snap locks 84, arranged as two pairs, with the snap locks 84 in each pair being arranged on the opposite side of the core 20 from each other. Flowever, it will be appreciated that any other suitable number of snap locks could be used, with other suitable arrangements with respect to the core 20.

In examples, to remove the core 20 from the frame 10, the snap locks 84 can be disengaged from the snap lock engagement holes 82. Therefore, in some examples, a distance between outer edges 108 of a pair of stand offs 90 located on opposite sides of the core 20 from each other is less than a distance between a pair of snap locks 84 located on opposite sides of the core 20 from each other. For example, a pair of snap locks 84 can be considered to be located on opposite sides of the frame to each other if their respective protuberances 88 extend away from the respective elongate portions 86 in opposite directions to each other.

In other words, in examples, the distance between the outer edges 108 of a pair of stand offs 90 is less than a distance between opposite walls of the core receiving portion 12 (for example the distance between opposing inward faces 96). This can, for example, allow the core 20 to slide laterally with respect to the frame 10 in a plane parallel to a face 102 of the stand offs 90 so that the core 20 can be displaced sideways with respect to the frame so as to allow the snap locks 84 on one side of the core 20 to disengage from their respective snap lock engagement holes 82 in the frame 10. In other words, for example, the stand offs 90 can slide laterally (e.g. side to side) within the stand off seats 80. In examples, the resilient bias of the elongate portions 86 of the snap locks 84 is arranged to help centralise the core 20 with respect to the frame 10, for example so that a central axis of the core 20 is aligned with a central axis (longitudinal axis 98) of the frame 10. In other words, for example, the resilient bias of the snap locks 84 is arranged do as to bias a central axis of the core 20 towards the central axis of the frame 10.

More generally, in examples, a removable core (such as core 20) for an air diffuser (such as air diffuser 1) of a heating, ventilation and/or air conditioning (HVAC) system, is capable of cooperating with a frame (such as frame 10) of the air diffuser so as to guide air through the air diffuser. In examples, the core 20 comprises a snap lock 84 extending from the core 20 and integrally formed with the core 20, and the snap lock 84 comprises a resilient elongate portion 86. In examples, the snap lock 84 comprises a protuberance 88 that extends away from the elongate portion 86, the protuberance 88 being capable of engaging with a snap lock engagement hole 82 formed in the frame 10 of the air diffuser 1 so as to hold the core 20 to the frame 10.

In examples, the elongate portion 86 is generally linear along its length. However, referring to Figure 21, in examples, the elongate portion 86 comprises a curved region 87 (for example a substantially arcuate portion) where the elongate portion 86 is joined with the core 20. This may, for example, help the elongate portion to resiliently flex more easily and help reduce the likelihood that the elongate portion may break. A neck adapter according to examples of the disclosure will now be described with reference to Figures 24 to 29. In order to connect an air diffuser, such as air diffuser 1, to ducting of an HVAC system, an adapter is commonly used so that the air diffuser 1 can be in fluid connection with the ducting. However, a cross section of duct can often be different from the cross section of the air diffuser where the duct is to be connected. In other words, for example, the air diffuser may need a different size connection from that needed to connect to the ducting.

For example, ducting to which the air diffuser is to be connected typically has a circular cross section, whereas air diffusers often have a square or rectangular cross section where they are to be connect to ducting of the HVAC system. Therefore, an adapter may commonly be used. Depending on the HVAC system for example, there are many different diameters of ducting used and this may necessitate different adapters to be provided, each with a different diameter for connecting to the ducting. Therefore, an installer or maintenance contractor may have to carry around many different adapters in order to try to make sure they have the right sized adapter for the ducting. This may be cumbersome and time consuming for the contractor, especially if working at height where different adapters may need to be carried up a ladder or on scaffolding, or the size of ducting checked first so that the right size adapter can then be fetched and fitted.

Examples of the disclosure seek to address these issues. Figure 24 schematically shows a neck adapter 200 according to examples of the present disclosure, and Figure 25 schematically shows the neck adapter 200 mounted on the frame 10 according to examples of the present disclosure. In particular, in examples, the neck adapter 200 is for connecting an air diffuser to a duct of a heating, ventilation and/or air conditioning (HVAC) system. In examples, the neck adapter comprises a first portion 210 for connecting to the air diffuser 1. In examples, the first portion 210 has a first size corresponding to a size of a duct to which the first portion can be connected.

In examples, the adapter 200 comprises a second portion 220 connected to the first portion 210. In examples, the second portion 220 has a second size corresponding to a size of a duct to which the second portion can be connected. In examples, the adapter 200 comprises a tear-away strip 230 between the first portion 210 and the second portion 220. In examples, the tear-away strip 230 can be torn away so that the second portion 220 can be detached from the first portion 210. In examples, the first size is different from the second size. In examples, the first size is bigger than the second size.

In other words, for example, the first portion 210 and the second portion 220 can be thought of as necks for connecting to ducts of corresponding sizes. More generally, in examples, the portions 210 and 220 can be thought of a neck portions of the neck adapter 200. In examples, the first portion 210 and the second portion 220 are generally tubular and are connected together by a shoulder portion 235 in which the tear away strip 230 is formed. More generally, in examples, the neck adapter 200 comprises the first portion 210, the second portion 220, and a shoulder portion 235 between the first portion 210 and the second portion 220.

Therefore, for example, by detaching or removing the tear away strip 230 so that the second portion 220 can be detached from the first portion 210, an installer can select a size of neck that corresponds to the size of ducting to which the adapter 200 is to be connected. In other words, for example, the neck adapter 200 of the disclosure can allow connection to different sizes of ducting without having to provide many different sizes of individual adapters.

Figure 26 schematically shows the neck adapter together with a tear off strip according to examples of the present disclosure. In particular. Figure 26 schematically shows the first portion 210 detached from the tear away strip 230 and from the second portion 220. For example, an installer or maintenance contractor upon inspection of the ducting may find that the size of the ducting corresponds to the size of the second portion 220. Therefore, they may connect the neck adapter 200 to the air diffuser 1 and connect the ducting to the second portion 220 to the ducting so that the ducting is in fluid communication with the air diffuser, in other words, for example so that air or other gases can flow between the air diffuser 1 and the ducting.

Flowever, if, for example, the installer or maintenance contractor finds that the size of the ducting corresponds to the size of the first portion 210, they may decide to connect the ducting directly to the first portion 210. Flowever, this may restrict air flow since, in the example shown in Figure 26, the size of the second portion 220 is smaller than the size of the first portion 210. Therefore, the tear-away strip can be removed so as to separate the second portion 220 from the first portion 210. Accordingly, examples of the present disclosure may help improve air flow whilst still allowing for different sizes of ducting.

In order to facilitate connection of the neck adapter 200 to the air diffuser 1, in examples, the first portion 210 comprises an air diffuser engaging portion 240. In examples, a cross section of the first portion 210 is different from the cross section of the air diffuser engaging portion 240. For example, referring to Figures 24 to 26, a cross section of the air diffuser engaging portion 240 is substantially rectangular, whereas a cross section of the first portion 210 is substantially circular. It will be understood that rectangular can include square since a square is a rectangle that has four sides of equal length.

In examples, the cross section of the first portion 210 is substantially the same shape as the cross section of the second portion 220. In examples, the cross section of the second portion 220 is substantially circular. In examples the cross section of the first portion 210 is substantially circular. However, it will be appreciated that the cross section of the first portion 210 could be different from the cross section of the second portion 220. For example, the cross section of the first portion 210 could be substantially square, and the cross section of the second portion 220 could be substantially circular. However, it will be appreciated that the first portion 210 and the second portion 220 could have any cross section as appropriate for connecting to ducting that the neck adapter 200 might be connected to.

Additionally, it will be appreciated that, although in examples a first portion 210 and a second portion 220 are shown, the neck adapter 200 could comprise two or more neck portions, each having a respective size that corresponds to a size of a duct to which the respective neck portion can be connected. Additionally, for example, the neck adapter 200 could comprise a plurality of tear-away strips, with each tear-away strip being located between adjacent neck portions. In other words, in examples, the tearaway strips are positioned between neck portions (such as portions 210 and 220) that are next to each other.

Figure 27 schematically shows the neck adapter 200 together with snap locks for securing the adapter 200 to the frame 10 according to examples of the present disclosure, and Figure 28 schematically shows the frame 10 and snap lock holes according to examples of the present disclosure.

In examples, the neck adapter 200 comprises an adapter snap lock 250 for engaging with the air diffuser 1 so as to hold the neck adapter 200 to the air diffuser. In examples, the neck adapter comprises four adapter snap locks 250 formed in the air diffuser engaging portion 240, for example such as snap locks know in the filed of plastics engineering. However, it will be appreciated that any suitable number of adapter snap locks 250 could be used. In examples, a plurality of adapter engagement holes 260 are formed in the frame 10 for engaging with the adapter snap locks 250 of the neck adapter 200. Therefore, in examples, the neck adapter snap locks 250 can cooperate with the adapter engagement holes 260 so as to hold the neck adapter 200 to the frame 10.

In examples, one or more of the first portion 210 and the second portion 220 comprise a plurality of teeth 270 arranged to extend away from the neck adapter 200 so as to help secure a duct to which the neck adapter may be connected to the neck adapter 200.

In examples, the neck adapter 200 is formed as one piece, for example by injection moulding. In examples, the first portion 210, the second portion 220 and the tear-away strip 230 are integrally formed with each other. In examples, the tear-away strip is defined by perforations (such as perforations 280 shown in Figure 27) formed in the neck adapter 200 along the edges of the tear-away strip. In other examples, the perforations may be omitted and the tear way strip 230 defined by thin-wall portions of the shoulder portion 235.

Figure 29 schematically shows a cross sectional view of a tear away strip according to examples of the present disclosure. In particular, for example. Figure 29 shows a cross section through a wall of the first portion 210, a wall of the shoulder portion 235, and the tear-away strip 230. In examples, the edges of the tear-away strip in the perimeter direction (or circumferential direction if, for example, the shoulder portion 235 has a circular cross section perpendicular to the longitudinal axis of the neck adapter) are defined by strip defining portions 237 whose wall thickness is less than that of a wall thickness of adjacent portions of the neck adapter.

For example, a wall thickness 239 of the shoulder portion 235 is greater than a wall thickness 241 of the strip defining portion 237a. In these examples, strip defining portion 237a is adjacent to the tear-away strip 230 and the shoulder portion 235. In other words, for example, the tear-away strip 235 can be considered as a portion of the neck adapter 200. More generally, in examples, the tear away strip 230 comprises strip defining portions 237 whose wall thickness is thinner than a surrounding wall thickness of the neck adapter 200. In other examples, the strip defining portions 237 may be combined with the perforations 280.

Therefore, for example, the tear-away strip can be removed from the neck adapter 200 by tearing (for example breaking) the material of the neck adapter 200 along the strip defining portions 237.

In examples, the air diffuser engaging portion 240 is integrally formed with the first portion 210. In examples, the tear-away strip 230 comprises a tab 290 that extends above a surface of the neck adapter 200. For example, a user can grip the tab 290 so as to pull it and remove the tear-away strip 230. In examples, neck adapter 200 comprises an indicator arrow 291 for indicating to a user a direction that the tab 290 can be pulled so as to help ensure clean removal of the tear-away strip 230. Therefore, for example, a user such as an installer or maintenance engineer can easily choose which size of neck portion they which to use for example to connect to a duct by removing the tear-away strip 230 or leaving it in place.

Typical HVAC systems comprise a filter located in the air conditioning unit so as to help filter out particulates (for example contaminants such as dust and dirt), from the air before it is chilled and humidity reduced by the air conditioning unit. The air conditioned air is then typically circulated through ducting to be distributed into the building, for example through an air diffuser.

However, while the air may be filtered at the air conditioning unit, dust, dirt, bacteria and other contaminants can build up in the ducting which can be difficult to clean. Additionally, if for example, an HVAC system is not in operation over a period of time, such as over winter where cooling may not be needed, or over a holiday period where the building may be empty, levels of contaminants such as dust and dirt can build up in the ducting which may then be distributed through the building when the HVAC system is switched back on. More generally, contaminants may build up in an HVAC over time with normal use.

In order to address these issues, in examples, the air diffuser 1 comprises a filter arranged to filter air passing through the core receiving portion 12. Therefore, for example, the air can be filtered by the air diffuser 1 and a level of contaminants such as dust and dirt in the air reduced by the filter.

Figure 30 schematically shows a rear view of a filter mounted in the frame 10 according to examples of the present disclosure. Figure 31 schematically shows a cross sectional view of the filter mounted in the air diffuser 1 according to examples of the present disclosure, Figure 32 schematically shows a front view of the filter mounted in the frame 10 according to examples of the present disclosure, and Figure 33 schematically shows an enlarged partial view of the filter, the frame 10, and the core 20 according to examples of the present disclosure.

In particular, in examples, the air diffuser 1 comprises an air filter 300. In examples, the air filter 300 is arranged so that it can filter air flowing from the core receiving portion 12 to the air guiding portion 14. In examples, the filter comprises a high efficiency particulate arresting (HEPA) filter, although it will be appreciated that other suitable types of filter could be used.

In examples, the air diffuser 1 comprises a ledge 310 integrally formed with the frame 10 and positioned within the core receiving portion 12 so as to locate the filter 300 within the frame 10. In examples, the ledge 310 is integrally formed with the inward face 96 of the core receiving portion 12 and extends away from the inward face 96. In examples, the ledge 310 is formed either side of the core receiving portion 12 on inward faces 96 of the core receiving portion 12 that are opposite to each other. In examples, the ledge 310 is the same as the guide plate support ledge 510 described later below, although it will be appreciated that it could be different to the guide plate support ledge 510. In examples, the ledge 310 formed on one side of the core receiving portion 12 is different from the ledge 310 formed on the other side of the core receiving portion 12. In examples, the ledge 310 is continuous along its length along the inward face 96. In other examples, the ledge 310 is discontinuous along the inward face 96.

In some examples, the ledge 310 comprises one or more filter support projections 311, arranged to extend from the ledge 310 in a direction substantially perpendicular to the direction of the ledge 310. In examples, the filter support projections 311 are arranged to be able to support the filter 300 between the ledge 310 and the stand offs 90. In some examples, the ledge 310 on one side of the core receiving portion 12 comprises the ledge 310 and is continuously formed, and the ledge 310 (for example corresponding to guide plate support ledge 510 as described later) on the other side of the core receiving portion 12 is discontinuous and comprises filter support projections 311. This may help reduce manufacturing costs by helping to reduce an amount of material, such as plastics material, that is used to form the frame 10.

More generally, in examples, the frame 10 comprises a first ledge (such as ledge 310) and a second ledge (such as guide plate support ledge 510) located on opposite sides of the core receiving portion to each other. In examples, the first ledge is different from the second ledge, although it will be appreciated that they could be the same as each other.

In examples, the filter is located between the ledge 310 and the standoffs 90 of the core 20. In other words, in examples, the filter 300 can be held between the stand offs 90 and the ledge 310. Therefore, for example, the filter 300 can easily be changed by removing the core 20 because the filter 300 is held in place (i.e. located within the frame 10) by the stand offs 90 and the ledge 310. However, it will also be appreciated that the filter 300 can be omitted from the air diffuser 1 if desired.

Referring to Figure 33, in examples, the base wall 94 of the stand off seat 80 comprises a filter snap lock step 301 arranged to engage with a filter step 303 formed in the filter 300. In examples, the filter snap lock step 301 comprises a curved portion facing the core 20 for engaging with the filter 300 so that the filter 300 can flex and the filter step 303 engage behind the filter snap lock step 301 so as to help hold the filter 300 to the frame. For example, this may temporarily help hold the filter 300 to the frame when the core 20 is not mounted to the frame 10, for example during installation or changing of the filter 300. More generally, in examples, the frame 10 is arranged so that the filter 300 can be inserted and removed from the front (for example as defined by the front face 16).

Figures 34A and 34B schematically show isometric views of the filter according to examples of the present disclosure, and Figures 35A and 35B schematically show plan views of the filter according to examples of the present disclosure. In particular, for example. Figure 34A shows a rear view of the filter 300 and Figure 34B shows a front view of the filter 300. In examples, the filter 300 comprises a filter frame 320 which is arranged to support a filter portion 330. In examples, the filter frame 320 comprises plastics materials, although it will be appreciated that other suitable materials could be used. In examples, the filter section 330 comprises a HEPA filter, although it will be appreciated that other suitable filtering materials could be used.

In examples, the filter frame 320 comprises filter support members 340 arranged to support filter material of the filter section 330. In examples, the filter frame 320 comprises a perimeter portion 350 whose dimensions substantially correspond with the dimensions of the core receiving portion 12 in a cross section plane of the frame 10 perpendicular to the longitudinal axis 98 of the frame 10. In examples, the perimeter portion 350 and the filter support members 340 are integrally formed with each other. In other words, in example, the filter frame 320 is moulded as one piece, from, for example, plastics material.

In examples, the filter frame 320 comprises stand off seat indents 360 formed in the perimeter portion 350 so that the filter frame 320 can fit around the stand off seats 80 of the frame 10 when the filter 300 is mounted in the air diffuser 1. In other words, for example, the stand off seat indents 360 allow the filter 300 to be mounted in the frame 10 so that the filter 300 abuts the ledge 310. In examples, the stand off seat indents 360 comprise respective filter steps 303 for engaging with the filter snap lock steps 301 of the stand off seats 80.

In examples, the filter 300 comprises a filter stand off 370 that extends away from a face of the filter 300. In examples, the filter stand off 370 is arranged to extend away from the centre of the filter support members 340. In examples, the filter stand off 370 is arranged to engage with the core 20 so as to help support a centre of the filter 300 with respect the core 20. In other words, for example, the filter stand off 370 can contact the core 20, when the filter 300 and core 20 are installed on the frame 10. In examples, the filter stand off 370 is arranged so that it can push against the core 20 in response to air flow through the filter 300 so as to inhibit motion of the filter 300 towards the core 20. For example, the likelihood that the filter 300 may vibrate, and for example cause noise, due to air flow through the filter 300 from the damper box 400 or core receiving portion 12 can thus be reduced.

As mentioned above, in examples, the air diffuser 1 comprises a damper box 400 within the core receiving portion 12. In examples, the filter 300 is located between the core 20 and the damper box 400. For example, this may help to reduce noise caused by damper blades of the damper box vibrating. Additionally, this may help any filter out particulate or contaminant build up on the damper blades.

The damper box 400 will now be described in more detail. Figure 36 schematically shows a rear view of the air diffuser 1 comprising the damper box 400, Figures 37A and 37B schematically show a guide plate together with a plurality of blades of the damper box 400, Figure 38 schematically shows the guide plate mounted in the frame 10, and Figure 39 schematically shows the blades and guide plate mounted in the frame 10, all according to examples of the disclosure. In examples, the damper box 400 can be thought of as a damper 400 for an air diffuser of a heating, ventilation and/or air conditioning (HVAC) system. In examples, the damper 400 is an opposed blade damper although it will be appreciated that the damper 400 could be a parallel blade damper or have other suitable arrangements of damper blades.

Referring to Figures 36 to 39, in examples, the damper 400 comprises a hollow housing 500 comprising a guide plate support ledge 510. In examples, the housing 500 can be thought of as corresponding to the core receiving portion 12, although it will be appreciated that the damper box could be used independently of the air diffuser 1. In examples, the housing 500 has a square or rectangular hollow aoss section (for example in a plane parallel to the front face 16), although it will be appreciated that the housing 500 could have other suitable cross sections. In examples, the guide support ledge corresponds to the ledge 310 described above with respect to the filter 300. However, it will be appreciated that the guide plate support ledge 510 could be positioned elsewhere in the housing 500.

In examples, the damper 400 comprises a plurality of substantially laminar damper blades 520 mounted within the housing 500 across the inside of the housing 500. For example, the laminar damper blades 520 may be thought of as sheet like. Although in some examples, the damper blades 520 are flat or substantially planar, it will be appreciated that the damper blades 520 could be curved or have other suitable shapes. Additionally, it will be appreciated that the damper blades could be different from each other, although in other examples, the damper blades 520 are the same as each other.

In examples, the damper blades each comprise pivot portions 530 that pass through respective blade support holes 540 formed in the wall of the housing 500. In examples, the damper blades 520 are rotatable about a longitudinal axis of the damper blades 520. In other words, for example, the damper blades 520 are rotatable about the pivot portions 530.

In examples, the damper 400 comprises a guide plate mounted within the housing 500 and arranged to cooperate with the damper blades 520 so that linear movement of the guide plate 550 with respect to the housing 500 along the guide plate support ledge 510 can cause the damper blades 520 to rotate with respect to the housing 500. In examples, the guide plate 550 comprises a plurality of longitudinal slots 560 formed in the guide plate 550, through which the pivot portions 530 on one side of the housing 500 pass so as to hold the guide plate 550 between the damper blades 520 and the housing 500.

Therefore, for example, the damper of the present disclosure helps improve smoothness of operation because the guide plate 550 can slide along guide plate support ledge 510. Additionally, for example, the damper of the present disclosure can help improve ease of assembly of a damper because the guide plate 550 is held between the damper blades 520 and the housing 500 and supported by the guide support ledge 510.

For example, to assemble the damper 400, the guide plate 550 can be placed on the guide support ledge 510 within the housing 500 so that the guide plate 550 is supported on the guide plate support ledge 510. In examples, the damper blades 520 can then be positioned so that the pivot portions 530 pass through the longitudinal slots 560 and engage with the blade support holes 540 formed in a side of the housing 500 closest to the guide plate 550. In examples, the guide plate 550 can thus be held in place whilst the blades 520 are flexed, for example, so that pivot portions 530 at an end of the damper blades 520 opposite to the guide plate 550 can be inserted into corresponding blade support holes 540 formed in a wall of the housing 500 opposite to the guide plate.

Therefore, for example, the guide plate 550 and the damper blades 520 can be installed in the housing 500 quickly and simply. So as to assist with installation of the damper blades in the housing for example, in examples the damper blades 520 are resiliently bendable along the longitudinal axis of the damper blades 520.

In examples, the damper blades 530 are rotatable between a closed position in which edges of the damper blades 530 are in contact with each other, and an open position in which the damper blade edges are spaced apart from each other. In other words, for example, the damper blades can be rotated so as to control air flow through the damper 400.

In examples, the longitudinal slots 560 are dimensioned so as to accommodate linear movement of the guide plate 550 with respect to the housing. In other words, in examples, a dimension in a direction perpendicular to the long axis of the longitudinal slots is greater than a dimension (such as a diameter) of the pivot portions 530 of the damper blades 520. In examples, the guide support ledge 510 is arranged to extend along an inner wall of the housing 500 and to be perpendicular to a central axis of the housing that is perpendicular to the rotational axis of the damper blades 520.

If the guide plate support ledge 510 is omitted, then this may mean that there is some play in the guide plate 550 when it is shifted linearly with respect to the housing 500 such that it shifts side to side in a direction different to the linear direction of motion, thus possibly making it more difficult to rotate the damper blades. However, in examples, the guide plate 550 can move linearly along the guide plate support ledge 510 with respect to the housing 500 which can thus help reduce play or undesired movement of the guide plate 550. Therefore, for example, the operational smoothness of the damper 400 may be improved.

In examples, each damper blade 520 comprises two pivot portions 530 located at opposite ends of the damper blade 520. However, it will be appreciated that in other examples, a damper blade 520 could comprise one pivot portion 530 with appropriate changes being made to the design of the damper blade 520 so it can be supported by one pivot portion 530.

Figure 40 schematically shows an isometric view of a guide plate according to examples of the present disclosure, and Figures 41A to 41D schematically show plan views of the guide plate according to examples of the present disclosure. In examples, the guide plate 550 comprises a plurality of elongate slots 570 formed in the guide plate 550 which extend in a direction different from a longitudinal direction of the longitudinal slots. In examples, the elongate slots 570 extend in a direction substantially at right angles to the longitudinal direction. For example, referring to Figures 40 and 41, the major axis of a longitudinal slot 560a is perpendicular to the major axis of elongate slot 570a. However, it will be appreciated, for example, that the longitudinal slots 560 need not be perpendicular to the elongate slots 570. For example, their major axes could be angled with respect to each so as to form an angle that is different from ninety degrees.

Figure 42 schematically shows a damper blade 520 according to examples of the present disclosure, and Figures 43A to 43D schematically show plan views of a damper blade 520 according to examples of the present disclosure. In examples, the damper blades 520 comprise a blade portion 580 and a projection portion 590 that extends longitudinally from the blade portion 580. In examples, the projection portion 590 is spaced apart from a pivot portion 530 on one side of the damper blade 520.

In examples, a first pivot portion 530a on one side of the damper blade 520 is different from a second pivot portion 530b on the opposite side of the damper blade 520. However, it will be appreciated that they could be the same as each other. In examples, the projection portion 590 is spaced apart from the first pivot portion 530a along an edge 592 of the blade portion 580 on one side of the damper blade 520. In other words, in examples, the projection portion 590 is offset from the axis of rotation of the damper blade as defined by the pivot portions 530.

In examples, the pivot portions 530 are integrally formed with the blade portion 580 and extend longitudinally from the blade portion 580. In examples, the projection portions 590 are integrally formed with the blade portion 580. More generally, in examples, the damper blades 520 are each integrally formed as one piece. Therefore, for example, the damper blades can be moulded from a material such as plastics material.

In examples, the projection portions 590 are arranged to cooperate with the elongate slots 570 so that linear motion of the guide plate 550 along the guide plate support ledge 510 can cause the damper blades 520 to rotate with respect to the housing 500. In other words, in examples, the projection portions 590 are inserted in the elongate slots 570. For example, movement of the guide plate 550 in the longitudinal direction of the guide plate (e.g. parallel to the major axis of the longitudinal slots 560) can cause a force to be exerted on the projection portions 590 by the elongate slots 570 such that the damper blades 520 are caused to rotate about the axis of the pivot portions 530. In examples, the projection portions 590 are slidable within the elongate slots 570.

In examples, the pivot portion 530 comprises a pivot portion support region 600 that extends into the blade portion 580. This may help reduce breakage of the damper blade where the pivot portion 530 joins the blade portion 580 for example, and so may help extend the lifetime of the blade 520. In examples, the pivot portion support region 600 is thicker than a thickness of the blade portion 580 where the pivot portion support region 600 joins the blade portion 580.

In examples, the projection portion 590 comprises a projection portion support region 610 that extends into the blade portion 580. In examples, the projection portion support region 610 is thicker than a thickness of the blade portion 580 where the projection portion support region 610 joins the blade portion 580. These features, may for example, help reduce breakage of the damper blade where the projection portion 590 joins the blade portion 580 and so may help extend the lifetime of the blade 520.

In examples, a stiffness of the blade 520 over a distance 581 in the longitudinal direction corresponding to the pivot support region 600 is greater than a stiffness of the blade 520 over a distance 583 corresponding to longitudinal distance between the pivot support regions 600. In other words, for example, an outer region of the blade 520 in the longitudinal direction (for example corresponding to distance 581) has a greater longitudinal stiffness than a central region of the blade 520 (for example corresponding to distance 583). That is to say, in examples, a central portion of the blade 520 (for example corresponding to distance 583) is more flexible in the longitudinal direction than distal portions of the blade 520 (for example corresponding to distance 581). This may, for example, help installation of the blades 520 in the housing 500 because the blade may be longitudinally flexed whilst still allowing the outer regions to be stiff enough to support the blade 520 and allow engagement with the blade engagement holes 540.

Referring to Figure 43D, in examples, the damper blades 520 are tapered towards the edge of the blades in a direction perpendicular to the longitudinal direction of the damper blades 520. In other words, for example, the thickness of the damper blade at the longitudinal edges of the damper blade 620 is less than the thickness of the damper blade 520 at a region located between the longitudinal edges. This may for example, help improve air flow through the damper 400 and may help reduce noise caused by gas flow through the damper 400.

In examples, the pivot portions 530 comprise a detent portion 615. In examples, the detent portion 615 can act as a detent so as to cooperate with a blade support hole 540 and hold the blade 520 to the housing 500 and so resist removal of the pivot portion 530 from the hole 540. In examples, the first pivot portion 530a at one end of the damper blade 520 comprises the detent portion 615. In examples, the second pivot portion 530b at the opposite end of the damper blade from the first pivot portion 530a is substantially cylindrical. In other words, for example, the second pivot portion 530b does not comprise a detect portion 615. However, it will be appreciated that both the first pivot portion 530a and the second pivot portion 530b could comprise a detent portion 615, or that only the second pivot portion 530b could comprise the detent portion 615. Additionally, it will be appreciated that the detent portion 615 could be omitted.

Referring to Figures 40 and 41, in examples, the guide plate 550 comprises a projecting tab 620 that extends away from the guide plate 550 towards the damper blades 620. In examples, the guide plate 550 is substantially sheet like. For example, the projecting tab 620 extends away from (for example projects out from) the plane of the guide plate 550. For example, a user may press or hold the projecting tab 620, for example by reaching through the core 20, so as move the guide plate 550 linearly within the housing and so cause the damper blades 520 to rotate to a desired angle with respect to the housing 500 (and hence with respect to air flow through the housing 500 for example).

It will be appreciated that the examples described herein may be used in commercial or residential HVAC systems for example.

It will be appreciated that where a plurality of features have been referred to in the plural such as damper blades, then the features and characteristics of those features may be applied to the singular (such as one damper blade) or to one of more of the plural. Additionally, it will be appreciated that where a plural is used, then one or more of the items referred to in the plural may have the same features as each other, including all of the items in the plural having the same features as each other, although they need not have the same features as each other.

It will be appreciated that the features of one or more of any of the different examples described herein may be combined together as appropriate with changes as appropriate, which will be apparent to the skilled person from the present disclosure. Additionally, it will be appreciated that various additions, modifications, and alterations may be made to the disclosure by the skilled person without departing from the spirit and scope of the invention as defined in the appended claims.

Other examples and features of the disclosure are set out in the following numbered clauses. 1. A latching clip comprising: a frame comprising a hinge portion and a latch stop portion, the frame comprising a lip arranged along an edge of the frame; a latching element having a first portion and a second portion, the latching element being hinged to the frame by a hinge at the hinge portion, the hinge being located between the first portion and the second portion, and the latching element extending longitudinally in a direction substantially parallel to the axis of the hinge; and a substantially planar resilient biasing element arranged between the frame and the latching element so as to connect the frame to the latching element, in which: the latching element is movable between a first position at which the first portion of the latching element is urged towards the latch stop region by the biasing element, and a second position at which the first portion of the latching element is urged towards the lip by the biasing element; and the latching element and the biasing element are arranged so that the latching element can move about the axis of the hinge from the first position to the second position in response to movement of the second portion towards the lip. 2. A latching clip according to clause 1, in which the resilient biasing element comprises an elastomer. 3. A latching clip according to clause 2, in which the resilient biasing element comprises rubber. 4. A latching clip according to any preceding clause, in which the resilient biasing element is perforated. 5. A latching clip according to any preceding clause, in which: the biasing element comprises a first end for securing the biasing element to the frame, a first loop being formed in the first end; and the latching clip comprises a first securing rod arranged to cooperate with the first loop so as to secure the first end of the biasing element to the frame. 6. A latching clip according to clause 5, in which: the frame comprises a first pair of rod securing hooks; and the first securing rod is arranged to pass through the first loop of the biasing element and cooperate with the first pair of rod securing hooks so as to hold the first securing rod to the first pair of rod securing hooks. 7. A latching clip according to any preceding clause, in which: the biasing element comprises a second end for securing the biasing element to the latching element, a second loop being formed in the second end; and the latching clip comprises a second securing rod arranged to cooperate with the second loop so as to secure the second end of the biasing element to the latching element. 8. A latching clip according to clause 7, in which: the latching element comprises a second pair of rod securing hooks; and the second securing rod is arranged to pass through the second loop of the biasing element and cooperate with the second pair of rod securing hooks so as to hold the second securing rod in the second pair of rod securing hooks. 9. A latching clip according to any of clauses 1 to 4, in which: a loop is formed in at least one of the ends of the biasing element; and the latching clip comprises a securing rod arranged to cooperate with the loop so as to secure the biasing element to at least one of the frame and the latching element. 10. A latching clip according to any preceding clause, in which: the latching element comprises a trunnion; the hinge portion comprises a trunnion seat arranged to cooperate with the trunnion so that the latching element can pivot about the axis of the hinge. 11. A latching clip according to clause 10, in which the trunnion seat is open and the biasing element is arranged so as to urge the trunnion into the trunnion seat. 12. A latching clip according to clause 10 or clause 11, in which a pair of trunnions is located either side of the latching element. 13. A latching clip according to any preceding clause, in which the hinge portion and the latch stop portion are integrally formed with the frame. 14. A latching clip according to any preceding clause, comprising plastics material. 15. A latching clip according to any preceding clause, in which the first portion extends beyond the lip in the direction of the plane of the lip when the latching element is in the second position. 16. A latching clip according to any of clauses 1 to 14, in which the first portion extends in the direction of the plane of the lip when the latching element is in the second position so that the end of the first portion coincides with an edge of the lip. 17. A latching clip according to any preceding clause, in which the first portion is longer than the second portion. 18. A latching clip according to any preceding clause, in which the latching element has a generally c-shaped cross section. 19. An air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising a latching clip according to any preceding clause. 20. An air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising a pair of latching clips according to any preceding clause, the pair of latching clips being arranged on opposite sides of the air diffuser to each other. 21. A latching clip substantially as described herein with reference to the accompanying drawings. 22. An air diffuser substantially as described herein with reference to the accompanying drawings.

Claims

1. An air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising: a frame comprising a core receiving portion formed through the frame and through which air can pass, and an air guiding portion for guiding air flowing through the core receiving portion; a removable core arranged to engage with the core receiving portion so as to allow air to be guided through the core receiving portion in cooperation with the air guiding portion; and a snap lock extending from the core and integrally formed with the core, the snap lock comprising a resilient elongate portion, in which: a snap lock engagement hole is formed in the core receiving portion; and the snap lock comprises a protuberance that extends away from the elongate portion, the protuberance being capable of engaging with the snap lock engagement hole so as to hold the core to the frame.

2. An air diffuser according to claim 1, in which when the core is held to the frame by the snap lock, the elongate portion is biased towards the frame so that the protuberance is pushed towards the snap lock engagement hole.

3. An air diffuser according to claim 1 or claim 2, in which: the frame comprises a frame arcuate portion between the air guiding portion and the core receiving portion; and the protuberance comprises a snap lock arcuate portion capable of cooperating with the frame arcuate portion so as to flex the elongate portion away from the frame.

4. An air diffuser according to claim 3, in which a radius of curvature of the frame arcuate portion is substantially the same as a radius of curvature of the snap lock arcuate portion.

5. An air diffuser according to any preceding claim, comprising: a plurality of snap locks each extending from the core and integrally formed with the core, each snap lock comprising a resilient elongate portion; in which: a plurality of snap lock engagement holes are formed in the core receiving portion; each snap lock comprises a protuberance that extends away from the elongate portion, the protuberances being capable of engaging with corresponding snap lock engagement holes so as to hold the core to the frame.

6. An air diffuser according to claim 5, in which one or more pairs of snap locks are located on opposite sides of the core.

7. An air diffuser according to any preceding claim, in which: the frame comprises a plurality of spacer seats integrally formed with the core receiving portion; and the core comprises a plurality of spacers that extend away from the core, the spacers being capable of cooperating with the spacer seats so as to align the core with respect to the core receiving portion.

8. An air diffuser according to claim 7, in which the spacers are integrally formed with the core.

9. An air diffuser according to any preceding claim, in which one or more of the frame and the core comprises plastics material.

10. An air diffuser according to any preceding claim, in which the core comprises louvered slats for guiding air through the core receiving portion.

11. An air diffuser according to claim 5, comprising: a plurality of stand offs integrally formed with the core, in which: a distance between outer edges of a pair of stand offs located on opposite sides of the core from each other is less than a distance between a pair of snap locks located on opposite sides of the core from each other.

12. An air diffuser according to any preceding claim, in which the elongate portion comprises a curved region where the elongate portion is joined with the core.

13. A removable core for an air diffuser of a heating, ventilation and/or air conditioning (HVAC) system, the core being capable of cooperating with a frame of the air diffuser so as to guide air through the air diffuser, the core comprising: a snap lock extending from the core and integrally formed with the core, the snap lock comprising a resilient elongate portion, in which: the snap lock comprises a protuberance that extends away from the elongate portion, the protuberance being capable of engaging with a snap lock engagement hole formed in the frame of the air diffuser so as to hold the core to the frame.

14. An air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising: a frame comprising a core receiving portion formed through the frame and through which air can pass, and an air guiding portion for guiding air flowing through the core receiving portion; a core arranged to engage with the core receiving portion so as to allow air to be guided through the core receiving portion in cooperation with the air guiding portion; a plurality of stand offs integrally formed with the core; and a plurality of stand off seats integrally formed with the frame and arranged to cooperate with respective stand offs so as to align the core with respect to the core receiving portion.

15. An air diffuser according to claim 14, in which: the standoff seats are arranged on opposite sides of the core receiving portion to each other.

16. An air diffuser according to claim 14 or claim 15, in which the stand off seats extend away from the core receiving portion.

17. An air diffuser according to any of claims 14 to 16, in which the standoffs are substantially laminar.

18. An air diffuser according to any of claims 14 to 17, in which the standoffs extend away from the core.

19. An air diffuser according to any of claims 14 to 18, in which the standoffs are fixedly held to the standoff seats by an interference fit.

20. An air diffuser according to any of claims 14 to 19, comprising: a snap lock extending from the core and integrally formed with the core, the snap lock comprising a resilient elongate portion, in which: a snap lock engagement hole is formed in the core receiving portion; and the snap lock comprises a protuberance that extends away from the elongate portion, the protuberance being capable of engaging with the snap lock engagement hole so as to hold the core to the frame.

21. An air diffuser according to any of claims 14 to 19, in which the standoffs are fixedly held to the standoff seats by an adhesive.

22. An air diffuser for a heating, ventilation and/or air conditioning (HVAC) system, the air diffuser comprising: a frame comprising a core receiving portion formed through the frame and through which air can pass, and an air guiding portion for guiding air flowing through the core receiving portion; a core arranged to engage with the core receiving portion so as to allow air to be guided through the core receiving portion in cooperation with the air guiding portion; and a filter arranged so as to allow air passing through the core receiving portion to be filtered.

23. An air diffuser according to claim 22, in which the filter is arranged so that it can filter air flowing from the core receiving portion to the air guiding portion.

24. An air diffuser according to claim 23, comprising a ledge integrally formed with the frame and positioned within the core receiving portion so as to locate the filter within the frame.

25. An air diffuser according to claim 24, comprising: a plurality of stand offs integrally formed with the core; and a plurality of stand off seats integrally formed with the frame and arranged to cooperate with respective stand offs so as to align the core with respect to the core receiving portion.

26. An air diffuser according to claim 25, in which the filter is located between the ledge and the standoffs.

27. An air diffuser according to any of claims 24 to 26, in which: the filter comprises a filter stand off that extends away from a face of the filter; and the filter stand off is arranged to engage with the core so as to support a centre of the filter with respect the ledge.

28. An air diffuser according to any of claims 22 to 27, comprising a damper box located within the core receiving portion, in which the filter is located between the core and the damper box.

29. A neck adapter for connecting an air diffuser to a duct of a heating, ventilation and/or air conditioning (HVAC) system, the neck adapter comprising: a first portion for connecting to the air diffuser, the first portion having a first size corresponding to a size of a duct to which the first portion can be connected; a second portion connected to the first portion, the second portion having a second size corresponding to a size of a duct to which the second portion can be connected; and a tear-away strip between the first portion and the second portion, in which: the tear-away strip can be torn away so that the second portion can be detached from the first portion.

30. A neck adapter according to claim 29, in which the first size is different from the second size.

31. A neck adapter according to claim 29 or claim 30, in which the first size is bigger than the second size.

32. A neck adapter according to any of claims 29 to 31, in which the first portion comprises an air diffuser engaging portion.

33. A neck adapter according to claim 32, in which a cross section of the first portion is different from the cross section of the air diffuser engaging portion.

34. A neck adapter according to claim 33, in which the cross section of the first portion is substantially circular and the cross section of the air diffuser engaging portion is substantially rectangular.

35. A neck adapter according to any of claims 29 to 34, in which the cross section of the first portion is substantially the same shape as the cross section of the second portion.

36. A neck adapted according to claim 35, in which the cross section of the second portion is substantially circular.

37. A neck adapter according to any of claims 29 to 36, comprising a snap lock for engaging with an air diffuser so as to hold the neck adapter to the air diffuser.

38. A neck adapter according to any of claims 29 to 37, in which one or more of the first portion and the second portion comprise teeth arranged to extend away from the neck adapter so as to help secure a duct to which the neck adapter may be connected to the neck adapter.

39. A neck adapter according to any of claims 29 to 38, in which the first portion, the second portion, and the tear-away strip are integrally formed with each other.

40. A neck adapter according to any of claims 29 to 39, in which the tearaway strip is defined by perforations formed in the neck adapter along the edges of the tear-away strip.

41. A damper for an air diffuser of a heating, ventilation and/or air conditioning (HVAC) system, the damper comprising: a hollow housing comprising a guide plate support ledge; a plurality of substantially laminar damper blades mounted within the housing across the inside of the housing, the damper blades each comprising pivot portions that pass through respective blade support holes formed in the wall of the housing, and the damper blades being rotatable about a longitudinal axis of the damper blades; and a guide plate mounted within the housing and arranged to cooperate with the damper blades so that linear movement of the guide plate with respect to the housing along the guide plate support ledge can cause the damper blades to rotate with respect to the housing, in which: the guide plate comprises a plurality of longitudinal slots formed in the guide plate, through which the pivot portions on one side of the housing pass so as to hold the guide plate between the damper blades and the housing.

42. A damper according to claim 41, in which the guide plate comprises a plurality of elongate slots formed in the guide plate which extend in a direction different from a longitudinal direction of the longitudinal slots.

43. A damper according to claim 42, in which the elongate slots extend in a direction substantially at right angles to the longitudinal direction.

44. A damper according to claim 42 or claim 43, in which; the damper blades comprise a blade portion and a projection portion that extends longitudinally from the blade portion; and the projection portion is spaced apart from a pivot portion on one side of the damper blade.

45. A damper according to claim 44, in which the pivot portions are integrally formed with the blade portion and extend longitudinally from the blade portion.

46. A damper according to claim 44 or claim 45, in which the projection portions are arranged to cooperate with the elongate slots so that linear motion of the guide plate along the guide plate support ledge can cause the damper blades to rotate with respect to the housing.

47. A damper according to any of claims 44 to 46, in which the pivot portion comprises a pivot portion support region that extends into the blade portion.

48. A damper according to any of claims 44 to 47, in which the projection portion comprises a projection portion support region that extends into the blade portion.

49. A damper according to any of claims 41 to 48, in which the damper blades are tapered towards the edge of the blades in a direction perpendicular to the longitudinal direction of the damper blades.

50. A damper according to any of claims 41 to 49, in which the guide plate comprises a projecting tab that extends away from the guide plate towards the damper blades.

51. A damper according to any of claims 41 to 50, in which the damper blades are rotatable between a closed position in which edges of the damper blades are in contact with each other, and an open position in which the damper blades edges are spaced apart from each other.

52. A damper according to any of claims 41 to 51, in which the damper blades are resiliently bendable along the longitudinal axis.

53. A damper according to any of claims 41 to 52, in which the pivot portions comprise a detent portion.

54. A damper according to any of claims 41 to 53, in which each damper blade comprises two pivot portions located at opposite ends of the damper blade.

55. A damper according to any of claims 41 to 54, in which the damper blades are each integrally formed as one piece.

56. A damper according to any of claims 41 to 55, in which the damper is an opposed blade damper.

57. An air diffuser substantially as described herein with reference to the accompanying drawings.

58. A removable core for an air diffuser substantially as described herein with reference to the accompanying drawings.

59. A neck adapter substantially as described herein with reference to the accompanying drawings.

60. A damper substantially as described herein with reference to the accompanying drawings.