AU2018264160B2

AU2018264160B2 - Exhaust Assembly

Info

Publication number: AU2018264160B2
Application number: AU2018264160A
Authority: AU
Inventors: Lucas Campbell; James Dare
Original assignee: Fantech Pty Ltd
Current assignee: Fantech Pty Ltd
Priority date: 2018-01-09
Filing date: 2018-11-19
Publication date: 2022-06-02
Anticipated expiration: 2038-11-19
Also published as: GB201818315D0; GB2570037B; ZA201807646B; NZ748497A; AU2018264160A1; GB2570037A

Abstract

: An exhaust assembly (100) is disclosed which includes a casing (102) defining a chamber (104) arranged to receive a fan (106). The casing comprises a first wind band (108) and a second wind band (110). The first wind band (108) defines a first open end of the casing and the second wind band (110) defines a second open end of the casing. The fan (106) is configured to induce a flow of fluid from the first open end through the casing to the second open end. The first and second wind bands (108, 110) are removeably coupled together to form the casing.

Description

"Exhaust Assembly"

Technical Field

[0001] Described embodiments relate generally to exhaust assemblies, such as exhaust assemblies suitable for mounting on rooftops.

Background

[0002] Exhaust assemblies are used in building ventilation systems to induce fluid circulation. For example, in some applications, exhaust assemblies are used to extract fluids from cooking areas, such as kitchens. Some exhaust assemblies are mounted external to buildings, on rooftops, for instance, to minimise noise and allow maintenance access.

[0003] Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims.

Summary

[0004] Some embodiments relate to an exhaust assembly comprising: a casing defining a chamber arranged to receive a fan; the casing comprising a first wind band and a second wind band; wherein the first wind band defines a first open end of the casing and the second wind band defines a second open end of the casing and the fan is configured to induce a flow of fluid from the first open end through the casing to the second open end; and wherein the first and second wind bands are removeably coupled together to form the casing.

[0005] The first wind band and the second wind band are substantially identical. In some embodiments, each of the first and second wind bands comprises a first band portion having a substantially uniform diameter and a second band portion having a diameter that narrows gradually towards a free end of the second band portion. The first wind band and the second wind band may taper towards the first open end and the second open end of the casing, respectively.

[0006] In some embodiments, the exhaust assembly comprises a base plate disposed within the first wind band and configured to cooperate with the first open end and an impeller of the fan to guide fluid flow from the first open end toward the impeller. The base plate may comprise a substantially planar section; and a cone extending from the substantially planar section and defining a fluid inlet; wherein the substantially planar section is disposed about the cone; and wherein the cone is arranged to cooperate with the impeller to allow fluid to be drawn from the first open end through the fluid inlet to the impeller. The base plate may be configured to span the first open end of the casing.

[0007] In some embodiments, a plurality of draining apertures is disposed in the base plate. In some embodiments, a plurality of draining apertures is disposed about an outer portion of the planar section of the base plate.

[0008] In some embodiments, the exhaust assembly comprises an adjustable mounting frame for adjustably mounting the fan within the casing. The adjustable mounting frame may comprise a motor plate configured to support a motor of the fan; and at least one bracket arm coupled to the motor plate at a first end and coupled to an inner wall of the casing at a second end; wherein the at least one bracket arm cooperates with the inner wall of the casing to support the motor plate. The adjustable mounting frame may further comprise at least one support bracket for coupling the at least one bracket arm to the inner wall of the casing. The at least one support bracket and the second end of the at least one bracket arm may be configured to cooperate with one another to allow the motor plate to be selectively positioned at one of a plurality of heights relative to the first or second open ends of the casing.

[0009] The exhaust assembly may comprise a removeable fan cover for covering a motor of the fan. The fan cover may comprise a motor cover having a first open end and a second open end, wherein the motor cover is configured to receive at least a part of the fan; and a cap coupled to the motor cover at the second open end; and wherein a gap is disposed between the cap and the motor cover to allow fluid flow from the first open end through the motor cover and to exit the exhaust assembly through the gap. The exhaust assembly may comprise a fan cover bracket for coupling the cap to the motor cover in a spaced-apart manner.

[0010] Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

Brief Description of Drawings

[0011] Some embodiments will now be described byway of non-limiting examples with reference to the accompanying drawings.

[0012] Figure 1 is a perspective view of an exhaust assembly, in accordance with some embodiments;

[0013] Figure 2 is a perspective view of across section of the exhaust assembly of Figure 1;

[0014] Figure 3 is a partially exploded perspective view of the exhaust assembly of Figure 1;

[0015] Figure 4 is a partially exploded perspective view of an underside of the exhaust assembly of Figure 1;

[0016] Figure 5 is aside view of across section of the exhaust assembly of Figure 1;

[0017] Figure 6 is a perspective view of a first wind band of the exhaust assembly of Figure 1;

[0018] Figure 7 is a perspective view of a second wind band of the exhaust assembly of Figure 1;

[0019] Figure 8 is a perspective view of abase plate of the exhaust assembly of Figure 1;

[0020] Figure 9 is a perspective view of a connecting ring of the exhaust assembly of Figure 1;

[0021] Figure 10 is a perspective view of a motor cover of the exhaust assembly of Figure 1;

[0022] Figure 11 is a perspective view of a cap of the exhaust assembly of Figure 1;

[0023] Figure 12 is a perspective view of a fan cover bracket of the exhaust assembly of Figure 1;

[0024] Figure 13 is a perspective view of a motor plate of the exhaust assembly of Figure 1;

[0025] Figure 14 is a perspective view of a bracket arm of the exhaust assembly of Figure 1;

[0026] Figure 15 is a perspective view of a support bracket of the exhaust assembly of Figure 1;

[0027] Figures 16 and 17 are perspective views of alternative base plates which may be used with the exhaust assembly of Figure 1, in accordance with some embodiments.

Description of Embodiments

[0028] Described embodiments relate generally to exhaust assemblies, such as exhaust assemblies suitable for mounting on rooftops.

[0029] Some embodiments relate to an exhaust assembly comprising first and second wind bands which are removably coupled together to form a casing of the exhaust assembly. In contrast to known exhaust assemblies, by providing an exhaust assembly that can be readily disassembled, for example, by decoupling the first wind band from the second wind band, components of the exhaust assembly can be easily accessed for maintenance and cleaning.

[0030] In some embodiments, the first wind band and the second wind band of the casing each taper inwards towards opposite open ends of the casing.

[0031] In some embodiments, the exhaust assembly comprises abase plate, or a spigot mount, disposed within the first wind band and configured to cooperate with the first open end and an impeller of the fan to guide fluid flow from the first open end toward the impeller, the base plate being provided with a plurality of apertures. The plurality of apertures provide for improved drainage. For example, in the event that one of the apertures becomes blocked by grease, dirt or leaves, for example, adequate drainage is still provided by way of any of the other of the apertures.

[0032] In some embodiments, the exhaust assembly comprises an adjustable mounting frame for adjustably mounting a fan within the casing of the exhaust assembly. Accordingly, the exhaust assembly of the described embodiments is capable of accommodating fans of varying heights within the casing.

[0033] In some embodiments, the exhaust assembly comprises a fan cover comprising a motor cover for receiving at least part of the fan via a first open end and a cap arranged to cooperate with a second open end, wherein a gap is disposed between the cap and the motor cover to allow fluid flow from the first open end through the motor cover and to exit the exhaust assembly through the gap. The gap provides ventilation to the fan, allowing air flow about the motor and thereby cooling the motor.

[0034] Referring now to Figures 1 to 5, there is illustrated an exhaust assembly 100, according to some embodiments. For example, the exhaust assembly may be configured to extract fluids from a particular regions within a building, such as a kitchen. In some embodiments, the exhaust assembly 100 may be arranged to cooperate with a duct element (not shown) of exhaust ducting (not shown) to provide fluid communication between the region within the building and an exterior of the building.

[0035] The exhaust assembly 100 comprises a casing 102 defining a chamber 104 for receiving a fan 106. In some embodiments, the fan 106 may be a centrifugal fan or a mixed flow fan. The fan 106 may comprise an electric motor 106A and an impeller 106B.

[0036] In some embodiments, an electrical termination or connection box 178 may be disposed on the casing 102. The electrical connection box 178 may allow for connection of electrical supply to the fan 106, without compromising the structural integrity of the casing 102. The electrical connection box 178 may further allow for connection of electrical supply to the electric motor 106A without requiring removal of sections of the casing 102.

[0037] The casing 102 comprises a first wind band 108 and a second wind band 110 removably coupled together to form the casing 102. The first wind band 108 defines a first open end 112 of the casing 102 and the second wind band 110 defines a second open end 114 of the casing 102. A fan 106 received within the chamber 104 of the casing 102 may be configured to induce a flow of fluid from the first open end 112 through the casing 102 to the second open end 114. In some embodiments, the fan 106 may be positioned within the chamber 104 of the casing 102 and spaced apart from inner walls 116 of the casing 102 to allow fluid to be conveyed from the first open end 112 of the casing 102, along a passageway provided between the fan 106 and the inner walls 116 to the casing 102 to the second open end 114, from where the fluid may exit the exhaust assembly 100.

[0038] The first and second wind bands 108, 110 are configured to cooperate with one another to removeably couple together to form the casing 102. The first and second wind bands 108, 110 may be formed in any suitable shape. For example, and as shown in Figures 6 and 7, the first and second wind bands 108, 110 may be substantially cylindrical or ring shaped. In some embodiments, the first and second wind bands 108, 110 are substantially identical. However, it will be appreciated that the first wind band 108 may be a different shape to that of the second wind band 110. In some embodiments, as shown in Figures 6 and 7, the first and/or second wind band 108, 110 may comprise a first band portion 118 having a substantially uniform diameter and a second band portion 120 having a diameter that narrows gradually towards a free end 122 of the first and/or second band portion 118, 120. The first and/or second wind bands 108, 110 may comprise a belt or connecting portion 124 disposed between the first band portion 118 and the second band portion 120. The first and/or second wind bands 108, 110 may comprise a rim 126, disposed at a free end 128 of the first band portion 118. The rim 126 may provide a sealing engagement between the first and second wind bands 108, 110 when the first and second wind bands 108, 110 are coupled together.

[0039] In some embodiments, the first and/or second wind band 108, 110 may have a thickness of between about 1mm and about 2mm, for example, about 1.2mm. The first and/or second wind bands 108, 110 may have a diameter of between about 0.3m and about Im. The first and/or second wind bands 108, 110 may have a height of between about 200mm and about 380mm, for example about 275mm. The first band portion 118 may have a height of between about 100mm and about 190mm, for example, about 120mm and the second band portion 120 may have a height of between about 100mm to about 190mm, for example, about 155mm. The rim 126 may have a width of between about 10mm and about 30mm. The first and/or second wind bands 108, 110 may be manufactured from any suitable material, for example, galvanized steel.

[0040] The first and/or second wind bands 108, 110 may taper towards respective free ends 122 such that when coupled together to form the casing 102 of the exhaust assembly 100, the first wind band 108 tapers or gradually narrows toward the first open end 112 of the casing 102 and the second wind band110 tapers or gradually narrows toward the second open end 114 of the casing 102. By tapering the second wind band 110 toward the second open end 114, the cross section of the second open end 114 is reduced. The reduced cross section presents a reduced open area of the casing 102 to meteorological conditions such as falling rain, thereby mitigating the chance of fluid entering the casing 102. The reduced cross section of the second open end 114 may also achieve an increased fluid velocity at the second open end 114 of the casing 102, resulting in an increase in discharge velocity of fluids exiting the exhaust assembly 100, and thereby increasing the likelihood of fluids being dispersed into the atmosphere instead of settling within the casing 102, on an exterior of the exhaust assembly 100, and/or on a roof of the building on which the exhaust assembly 100 is installed.

[0041] In some embodiments, the exhaust assembly 100 comprises abase plate 130, such as a spigot mount, disposed within the first wind band 108 and configured to cooperate with the first open end 112 of the casing 102 and the impeller 106B of the fan 106 to guide fluid flow from the first open end 112 toward the impeller 106B. The base plate 130 may be disposed at or within the first casing open end 112 and may be configured to span the first open end 112.

[0042] In some embodiments, as shown in Figure 8, the base plate 130 may comprise a substantially planar section 132 and a collar or cone 134 extending from the substantially planar section 132, the cone 134 defining a fluid inlet 136. The substantially planar section 132 may be disposed about the cone 134. The cone 134 may be disposed substantially centrally or off-centre of the base plate 130. The cone 134 may be arranged to cooperate with the impeller 106B of the fan 106 to allow fluid to be drawn from the first open end 112 through the fluid inlet 136 to the impeller 106B. For example, a free end 138 of the cone 134 may be configured to engage with the impeller 106B, and for example, may be configured to be received by the impeller 106B.

[0043] In some embodiments, the base plate 130 may comprise a plurality of apertures disposed about the base plate 130 to allow fluid to drain, such as precipitation which may enter through the second open end 114 to exit the exhaust assembly 100. For example, the apertures may be disposed about and towards an outer edge 140 of the base plate 130. In some embodiments, the plurality of apertures 142 is disposed in the substantially planar section 132 of the base plate 130. In the event that one of the apertures 142 becomes blocked by grease, dirt or leaves, for example, adequate drainage is still provided by way of any of the other of the apertures 142.

[0044] As shown in Figure 8, the base plate 130 may comprise a lip 144 extending from the outer edge 140 of the base plate 130 in the same direction as the cone 134. The lip 144 may be configured to cooperate or engage with an outer wall of the casing 102 to allow the base plate 130 to couple or connect to the casing 102.. For example, the free end 122 of the first wind band 108 of the casing 102 may be configured to sit or rest upon the base plate 130, such as the substantially planar section 132 of the base plate 130, such that an outer wall of the casing engages with or aligns with an inner surface of the lip 144 .

[0045] As shown in Figure 9, the exhaust assembly 100 may comprise a connecting ring or spigot flange 174 to for coupling the base plate 130 and accordingly, the casing 102 to exhaust ducting (not shown) of a building to provide fluid communication between the interior of the building and the exhaust assembly 100. As shown, the connecting ring 174 may comprise a projecting ridge 176 to allow for improved coupling with the exhaust ducting (not shown).

[0046] In some embodiments, the base plate 130 may have a thickness of between about 1mm and about 2mm, for example, about 1.2mm. The base plate 130 may have an outer diameter of between about 400mm and about 800mm. The apertures 142 may have a diameter of between about 18mm and about 30mm, for example, about 26mm. However, it will be appreciated that the base plate 130 may be configured to be any suitable size and shape for cooperating with a particular casing 102 and fan 106, or more particularly, impeller 106B, for example, as illustrated by base plates 130' and 130" of Figures 16 and 17, respectively.

[0047] In some embodiments, the exhaust assembly 100 comprises an adjustable mounting frame 148 for adjustably mounting the fan 106 within the casing 102. The adjustable mounting frame 148 may comprise a motor plate 150, such as that illustrated in Figure 13, received within the chamber 104 of the casing 102 and configured to support the motor 106A of the fan 106.

[0048] The mounting frame 148 may comprise at least one support bracket 152, such as that illustrated in Figure 15, for coupling the motor plate 150 to the inner walls 116 of the casing 102 and configured to allow selective positioning of the motor plate 150, and accordingly, the motor 106A, at one of a plurality of heights relative to the first or second open end 112, 114 of the casing 102. In some embodiments, the mounting frame 148 comprises at least one bracket arm 154, such as that illustrated in Figure 14, coupled to the motor plate 150 at a first end and coupled to the at least one support bracket 152 at a second end. The at least one support bracket 152 and the second end of the at least one bracket arm 154 may be configured to cooperate with one another to allow the motor plate 150 to be selectively positioned at one of a plurality of heights relative to the first or second open end 112, 114 of the casing102. For example, the support bracket 152 may comprise a plurality of slots disposed along a length of the support bracket 152, and the second end of the at least one bracket arm 154 may be configured to connect to the support bracket 152 at any one of the slots. In some embodiments, the second end of the at least one bracket arm 154 may be configured to slide within a channel defined along a length of the support bracket 152 and may be selectively fixable at any selected height along the channel. By allowing selective positioning of the fan within the chamber 104 relative to the first or second open end 112, 114 of the casing 102, various fan sizes can be accommodated by the exhaust assembly without needing to change the size of the wind bands.

[0049] By coupling the bracket arm(s) 154 to the first and/or second wind bands 108, 110, or inner wall 116 of the casing, for example, by means of the support bracket(s)

152, the bracket arm(s) 154 are positioned at a distance from the impeller 106B, mitigating any impact of the fan on the bracket arm(s) 154, for example, such as blade passing frequencies that may result in resonance between the fan 106 and components of the mounting frame 148 which may increase noise levels.

[0050] Furthermore, by coupling the bracket arm(s) 154 to the first and/or second wind bands 108, 110, or inner wall 116 of the casing, for example, by means of the support brackets 154, as opposed to coupling the bracket arm(s) 154 to the base plate 130, for example, less space is required within the chamber 104 of the casing 102 to accommodate bracket arm(s) 154 between the impeller 106B and the inner wall 116 of the casing, and accordingly, the first wind band 108 may have a reduced diameter.

[0051] As shown in Figure 13, the motor plate 150 may define a shaft aperture 156 for receiving a shaft 160 of the motor 106A, which may extend through the shaft aperture 156 and connect to the impeller 106B of the fan 106.

[0052] The motor plate 150 may be positioned within the casing 102 such that an annular space or gap is defined between the motor plate 150 and the inner wall 116 of the casing 102, allowing fluid flow from the first open end 112 of the casing 102, through the annular space or gap of the chamber towards the second open end 114 of the casing 102.. In some embodiments, the motor plate 150 may be positioned substantially centrally of the chamber 104 relative to the inner wall 116 such that the spacing between the motor plate 150 and the inner wall 116 of the casing 102 is substantially uniform.

[0053] In some embodiments, the motor plate 150 may have a thickness between about 1mm and about 3mm, for example, about 1,6mm. The motor plate 150 may have an outer diameter of between about 300mm and about 600mm. The shaft aperture 156 may have a diameter of between about 60mm and about 200mm. Each bracket arm 154 may have a length of between about 100mm and about 300mm. Each bracket arm 154 may be a square tube with a height and breadth of between about 18mm and about 32mm, for example about 25mm. The bracket arm 154 may have a thickness of between about 1mm and about 3mm, for example about 1.6mm. Each support bracket 152 may have a thickness between about 1mm and about 3mm, for example about 1.6mm. Each support bracket 152 may have a length of between about 90mm and about 150mm, for example about 120mm. The channel defined along the length of the of the support bracket 152 may have a depth between about 15mm and about 25mm, for example about 21.6mm.

[0054] In some embodiments, the exhaust assembly 100 comprises aremoveable fan cover 162 for covering the motor 106A of the fan 106. The fan cover 162 may comprise a motor cover 164, such as is illustrated in Figure 10, having a first open end 166 and a second open end 168. For example, the motor cover may be substantially frustrum or collar shaped. The motor cover 164 may be configured to receive at least a part of the fan 106 through the first open end 166. The fan cover 162 may comprise a cap 170, such as illustrated in Figure 11, arranged to cooperate with the motor cover 164 at the second open end 168. The cap 170 may be coupled to the motor cover 164 such that there is a gap 172 disposed between the cap 170 and the motor cover 164 to allow fluid flow from the first open end 166 through the motor cover 164 and to exit the exhaust assembly 100 through the gap 172. For example, the fan cover 162 may comprise a fan cover bracket 178 for coupling the cap 170 to the motor cover 164 in a spaced-apart manner. In some embodiments, and as shown in Figures 12, the fan cover bracket 178 may comprise an S-type bracket. The gap 172 provides for ventilation, allowing air flow about the fan 106 and thereby cooling the motor 106A.

[0055] The second open end 114 of the casing 102, the fan 106, the motor cover 164 and/or the base plate 130 may be relatively sized and arranged to mitigate the chance of precipitation entering the inlet 136 of the base plate 130 and passing into a duct element (not shown) of exhaust ducting (not shown) to which the exhaust assembly 100 may be connected in use. For instance, with reference to Figure 5, the motor cover 164 is sized and positioned relative to the second open end 114 of casing 102 and the inlet 136 of the base plate 130 to block or hinder fluid which may enter the second open end 114 from entering the inlet 136. Instead, any such fluid is likely to run off the inner wall

116 of the casing 102 or run off the fan cover 106 and be directed toward the drain apertures in the base plate 130.

[0056] Further, in an embodiment where the second wind band 110 of the casing 102 tapers inwards at the second open end 114 of the casing, a relatively smaller sized motor cover 164 may be required to block or hinder precipitation from entering the chamber 104 and the inlet 136 of the base plate 130, thereby allowing for increased space within the chamber 104, which in turn results in an exhaust assembly 100 which can deliver less reduction in airflow to an equivalent sized housing of conventional construction.

[0057] The motor cover 164 may have a thickness between about 1mm and about 2mm, for example about 1.2mm. The motor cover 164 may have a diameter of between about 200mm and about 620mm. The cap 170 may have a thickness of between about 1mm and about 2mm, for example about 1.2mm. The cap 170 may have an outer diameter of between about 190mm and about 500mm. The cap 170 may have a height of between about 40mm and about 70mm, for example about 50mm.

[0058] The various parts of the exhaust assembly 100 maybe manufactured from any suitable material, which may, for example, be galvanized steel or aluminium.

[0059] It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the above-described embodiments, without departing from the broad general scope of the present disclosure. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.

Claims

CLAIMS:

1. An exhaust assembly comprising: a casing defining a chamber arranged to receive a fan; the casing comprising a first wind band and a second wind band; wherein the first wind band defines a first open end of the casing and the second wind band defines a second open end of the casing and the fan is configured to induce a flow of fluid from the first open end through the casing to the second open end; wherein the first and second wind bands are removeably coupled together to form the casing; wherein the second wind band tapers gradually to the second open end of the casing, such that the cross section of the open area of the second open end is reduced; wherein the fan is configured to induce flow that is at least partly centrifugal; and

wherein the exhaust assembly includes a base plate disposed to span the first open end of the casing and configured to guide flow from the first open end towards the fan.

2. The exhaust assembly of claim 1, comprising a removeable fan cover for covering a motor of the fan, said fan cover being disposed in the second wind band and having a shape that tapers towards the second open end.

3. The exhaust assembly of claim 2, wherein the fan cover is frustum-shaped.

4. The exhaust assembly of claim 2 or claim 3, wherein the shapes of the second wind band and the fan cover taper at the same rate towards the second open end.

5. The exhaust assembly of any one of claims 2 - 4, wherein the fan cover extends to the second open end.

6. The exhaust assembly of any one of the preceding claims, wherein the first wind band and the second wind band are substantially identical.

7. The exhaust assembly of any one of the preceding claims, wherein each of the first and second wind bands comprises a first band portion having a substantially uniform diameter and a second band portion having a diameter that tapers gradually towards a free end of the second band portion.

8. The exhaust assembly of any one of the preceding claims, wherein the first wind band tapers towards the first open end of the casing.

9. The exhaust assembly of claim 1, wherein the base plate comprises a substantially planar section; and a cone extending from the substantially planar section and defining a fluid inlet; wherein the substantially planar section is disposed about the cone; and wherein the cone is arranged to cooperate with the impeller to allow fluid to be drawn from the first open end through the fluid inlet to the impeller.

10. The exhaust assembly of any one of the preceding claims, wherein a plurality of draining apertures is disposed in the base plate.

11. The exhaust assembly of claim 9, wherein a plurality of draining apertures is disposed about an outer portion of the planar section of the base plate.

12. The exhaust assembly of any one of the preceding claims, comprising an adjustable mounting frame for adjustably mounting the fan within the casing.

13. The exhaust assembly of claim 12, wherein the adjustable mounting frame comprises: a motor plate configured to support a motor of the fan; and at least one bracket arm coupled to the motor plate at a first end and coupled to an inner wall of the casing at a second end; wherein the at least one bracket arm cooperates with the inner wall of the casing to support the motor plate.

14. The exhaust assembly of claim 13, wherein the adjustable mounting frame comprises at least one support bracket for coupling the at least one bracket arm to the inner wall of the casing.

15. The exhaust assembly of claim 14, wherein the at least one support bracket and the second end of the at least one bracket arm are configured to cooperate with one another to allow the motor plate to be selectively positioned at one of a plurality of heights relative to the first or second openings of the casing.

16. The exhaust assembly of claim 2, wherein the fan cover comprises: a motor cover having a first open end and a second open end, wherein the motor cover is configured to receive at least a part of the fan; and a cap coupled to the motor cover at the second open end; and wherein a gap is disposed between the cap and the motor cover to allow fluid flow from the first open end through the motor cover and to exit the exhaust assembly through the gap.

17. The exhaust assembly of claim 16, wherein the exhaust assembly comprises a fan cover bracket for coupling the cap to the motor cover in a spaced-apart manner.