US3386368A - Ventilators - Google Patents

Ventilators Download PDF

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Publication number
US3386368A
US3386368A US551118A US55111866A US3386368A US 3386368 A US3386368 A US 3386368A US 551118 A US551118 A US 551118A US 55111866 A US55111866 A US 55111866A US 3386368 A US3386368 A US 3386368A
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Prior art keywords
impeller
ventilator
trumpet
air
fan
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US551118A
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English (en)
Inventor
Fielding Eric
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Colt Ventilation and Heating Ltd
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Colt Ventilation and Heating Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/02—Roof ventilation
    • F24F7/025—Roof ventilation with forced air circulation by means of a built-in ventilator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/12—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures
    • F04D25/14—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures and having shutters, e.g. automatically closed when not in use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/16—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of parallelly-movable plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow
    • F24F7/013—Ventilation with forced flow using wall or window fans, displacing air through the wall or window

Definitions

  • This invention relates to ventilators and is concerned with powered discharge ventilators of the kind including an extraction fan for promoting a flow of air through the ventilator, and for use mounted on a bounding structure (e.g.4a wall or roof) of a space from which air is to be withdrawn by the ventilator.
  • a bounding structure e.g.4a wall or roof
  • Powered discharge ventilators employing an extraction fan of the axial flow type wherein the fan has a cylindrical casing closely surrounding the fan impeller and in which the air enters and leaves the impeller in a direction substantially parallel to the axis of rotation of the impeller, the air being confined and guided by the cylindrical casing both on entering and leaving the impeller.
  • the volume of air delivered by such a fan depends inter alia on the diameter of the impeller and this in turn governs the diameter of the casing and accordingly the overall size of the ventilator.
  • a powered discharge ventilator including an extraction fan having an impeller and a fan casing and in which the tips of the impeller blades are closely surrounded by and conform to the shape of a trumpet mouthing portion of the casing the arrangement being such that in operation of the ventilator, air is free to leave the tips of the trailing edges of the impeller blades with a large component of movement substantially radially outwardly of the impeller.
  • the trumpet mouthing portion forms a smooth downstream continuation of an upstream portion of the casing leading air to the fan impeller, the impeller having a means diameter greater than the diameter of said upstream casing portion immediately upstream of the impeller.
  • the impeller By placing the impeller in a trumpet mouthing portion of the casing one may increase the effective diameter of the impeller compared with the impeller of a conventional ventilator employing an axial ow fan having a casing of diameter equal for example to said upstream casing portion immediately upstream of the impeller and in this way the veintilator may be made to shift more air for a given speed of rotation of the impeller Without increasing the overall size of the ventilator.
  • a still further advantage which is achieved using the arrangement according to the invention is that there is a noticeable reduction of noise compared with the conventional ventilator employing an axial flow fan and per forming an equivalent duty.
  • the impeller employed according to the invention may be an axial flow impeller having aerofoil sectioned blades or a propeller fan impeller having sheet form blades or a mixed flow fan impeller in which the blades are developed along a conical or a spherical hub surface.
  • the latter form of impeller makes optimum use of the regime provided for it is a ventilator according to the present invention in so far as the compound curvature of the impeller ⁇ blades imparts a greater radial component of movement to the airstream and the performance against added resistance upstream is still further improved.
  • An equivalent elfect can be course be achieved using a centrifugal fan, in which case the air is turned through a full when passing through the impeller.
  • Powered discharge ventilators employing centrifugal fans are well known. These are used where it is required to develop a high pressure to overcome resistance to the ow of air upstream of the ventilator and in accordance with the known characteristics of centrifugal fans this is achieved at the expense of the free inlet volume handled by the ventilator. Accordingly, to obtain a given volume output of air with free inlet, a bigger fan with a greater power requirement is necessary using a centrifugal fan instead of an axial ow fan and powered discharge centilators having centrifugal fans tend to take the form of large, high profile units and such unit, employed as roof extract ventilators, are often objectionable for purely aesthetic reasons.
  • the trumpet mouthing portion of the fan casing is confronted by a member presenting, towards the impeller a substantially flat coi-extensive surface disposed normal to the axis of rotation of the impeller, the trumpet mouthing portion having an inner wall surface which turns through ⁇ a full right angle, and said surface of ⁇ said member being predeterminedly spaced from the crown of the trumpet mouthing portion, at least in use of the ventilator, so as to constrain or assist in constraining air to ilow smoothly round the inner wall surface of the trumpet mouthing portion to the crown thereof without breaking away from the surface.
  • the airstream discharged by the impeller may be turned through 90 in a very eicient manner and in a small height, ⁇ and this materially assists in the production of a roof extract ventilator of low profile.
  • the ventilator may include means presenting confronting surfaces one as a peripheral extension of said surface of said member and the other as a peripheral extension of the inner wall surface of the trumpet mouthing portion, said confronting surfaces together vdefining a confined air discharge passage for streamline flow of the extracted air the through liow area of which progressively increases to an air discharge outlet from said passage to the outside atmosphere.
  • the velocity of the discharging airstream is progressively reduced as the airstream passes through the discharge passage and the kinetic energy of the airstream is reconverted to potential energy, the static pressure in the discharge passage increasing progressively towards the outlet. Additionally, since streamline ow is maintained, the losses are kept small. By slowing the air velocity at discharge as far as is practical within the dimensional limits required for the ventilator, the loss of the kinetic energy of the discharging airstream may be kept down and the eiiciency of the ventilator considerably improved.
  • the air discharge outlet is conveniently offset relative to the inlet to said air discharge passage in the direction of the axis of rotation of the impeller, and in this case said confronting surfaces are gently curved between said inlet and said outlet to prevent break away of the discharging airstream therefrom.
  • iFIG. 1 is a cross-sectional side elevation of a powered discharge roof ventilator according to the present invention, on line 1-1 in FIG. 2.
  • FIG. 2 is a plan view of the ventilator shown in FIG. 1, and
  • FIG. 3 is a cross-section on line 3--3 in FIG. 1.
  • the ventilator illustrated may be positioned on a flat or on a pitched roof.
  • the ventilator comprises a base which would be flashed to the roof in any known or convenient manner.
  • the base 10 is gener-ally rectangular in plan but with rounded corners and is of sheet metal construction in this example, opening upwardly to a circular sectioned throat portion 12 of a fan casing being connected therewith by means of a smoothly upwardly convergent transitional portion 11 of the casing.
  • the throat portion communicates with a smoothly upwardly divergent, circular sectioned trumpet mouthing portion 13 of the fan casing which turns through a full right angle and blends at the crown 14 of the trumpet mouthing portion with a peripheral outwardly extending ange 15.
  • the ange 1S has an upwardly directed surface which forms a smooth peripheral extension of the inner wall surface of the trumpet mouthing portion 13 and which extends outwardly and downwardly in a gently curved fashion or, at the four corners, radially outwardly and then outwardly and downwardly in a gently curved fashion to terminate at a peripheral edge 15 of generally rectangular contour with rounded corners.
  • An electric motor 16 is mounted centrally within the base 10 and extends into the throat 12 of the fan casing.
  • the motor has a cylindrical housing which delines with the fan casing at 12 an annular through flow opening 17 which presents the minimum through tiow area of the lair discharge passage of the ventilator being described.
  • the motor is supported on brackets 20 (see FIG. 3) attached at their inner ends as at 21 to the motor and at their outer ends one in each of the four corners of the base 10 as at 22.
  • Struts 23 are provided, one at each corner, interconnecting the 'base 10 with the underside of the flange 1S to support the flange 15 from the base 10.
  • the struts 23 are outside the fan casing.
  • the motor 16 drives an impeller 24, which is a mixed flow impeller having blades 25 of aerofoil cross-section developed along the conical surface 26 of a frusto-conical impeller hub 27 carried on the motor spindle 28.
  • the impeller is mounted and arranged to run with the trailing edges 29 of the impeller blades close to the plane of the crown 14 of the trumpet mouthing 13, which plane extends normal to the axis 30 of rotation of the impeller.
  • the tips of the blades are shaped to sweep closely a frusto-conical section 31 of the trumpet mouthing portion.
  • the section 31 could be contiuously curved instead of being frusto-conieal and the blade tips continuously curved to correspond. However for ease of manufacture of the impeller the former arrangement is preferred.
  • the ventilator is provided with a cowl 32 of inverted shallow-dished form which is generally rectangular in plan (see FG. 2) but with rounded corners so as to present a peripheral edge conforming in shape to the peripheral edge of the flange 15.
  • the cowl is supported on four posts 32 (see FIG. 3) one carried in each of the four corners of the liange 15 immediately over the struts 23.
  • the cowl has a central region which is very slightly domed for the purpose only of strengthening the structure of the cowl but which may be regarded as substantially ilat, whereby a cowl of very low prole is achieved.
  • the cowl has a peripheral edge portion 33 which is gently curved in a downward direction and the downwardly directed surface of the cowl portion 33 defines with the upwardly directed surface of th-e ange 1S a confined air discharge passage 34 extending radially outwardly and downwardly from an annular generally cylindrical inlet opening 35 at the crown 14 of the trumpet mouthing portion 13 and surrounding the axis 30 and an annular, downwardly directed outlet opening 36 disposed in a plane normal to the axis 30 on the side of the crown 14 remote from the central region of the cowl.
  • the ventilator has a damper which operates automatically to close the opening through the fan casing when the ventilator is not operating, to prevent downdraughts and to conserve heat in the building.
  • the damper is generally indicated at 41 and comprises a lightweight plate member 42 e.g. of thin gauge metal sheet, carrying a peripheral sealing member 43 having a sealing lip 44, the sealing member 43 resting on the crown 14 of the trumpet mouthing when the damper is closed.
  • the plate member 42 When the fan is operated the plate member 42 floats upwardly on the airstream and is held thereby, pressed against the underside of the cowl.
  • the member 42 is hinged along one edge to link means in the form of two swinging links 45 by hinge arms 46.
  • the arms 46 are pivoted to the links 45 as at 47 and the links are pivoted to depending brackets 48 attached to the underside of the cowl 32 as at 49.
  • Coil springs 5t bias the links 45 to the full line position illustrated in FIG. 1 in which the damper is closed.
  • the member 43 Towards its opposite edge 51, and arranged one towards each side edge 52 of the plate member 43, the member 43 is hinged to a pair of struts 55 which are in turn hinged one each to a pair of depending brackets 56 carried on the underside of the cowl 32.
  • the strut hinge axis extend parallel with the hinge axes of the pivots 47 and 49 and the struts 55 themselves extend forwardly, at an angle of about 50 to the plate member 43 when the damper is closed.
  • the plate member 43 In the closed position, the plate member 43 is held at a small angle to the plane containing the hinge axes of the pivots 47 and 49 and must be displaced through a position in which it lies in that plane when moving to its open position.
  • the shutter When the shutter is closed therefore it is held closed by the struts 55 and the shutter member is locked down by an over-center snap, or toggle action since the distance between the line along which the member 43 is hinged to the struts 55 and the line along which the links 45 are hinged to the brackets 48 is fixed and it is necessary for the arms 46 t-o fiex in order to allow the member 43 to pass through the in-line or over-center position of the toggle.
  • the springs 50 only lightly bias the member 43 to its closed position but are nevertheless sufiiciently strong to break the toggle in the opposite direction and move the damper to its fully closed position when the fan is shut down.
  • the plate member 43 is moved to its open position against the action of the springs 50 and the spring force increases slightly with defiection. This is made to compensate for the decreasing angle which the struts 55 make with the plate 43 as the member 43 opens a greater component of the air thrust on the front of the plate becoming available to overcome the stronger spring action, whereby the plate member 43 remains substantially parallel to its closed position as it moves between its closed position and its fully open position.
  • the plate member 43 presents towards the impeller a flat or substantially at surface which is co-extensive with the trumpet mouthing portion 13 of the fan casing so as to confront the whole of the trumpet mouthing portion when in its open position, the' member then lying normal to the axis 30.
  • an impeller of greater effective diameter may be used compared with the case where, as in a conventional powered discharge ventilator employing an axial flow fan, the impeller runs in a cylindrical casing having a diameter equal to the throat 12. Also the air leaving tips of the trailing edges 29 or the impeller blades is free to escape substantially radially outwardly over the inner wall surface of the trumpet mouthing portion towards the crown 14 and a proportion of the air is effectively turned into the discharge passage 34 without striking against the under surface of the non-return shutter member 43 or the underside of the cowl.
  • a pressure regime may be set up in the space between the trailing edges 29 of the impeller blades and the damper member 43 whereby part of the airstream is induced to flow smoothly round the trumpet mouthing portion to the crown 14 and, after striking against the under surface of the member 43, the remainder of the airstream can be made to flow substantially smoothly in a radially outward direction towards the inlet 35 of the discharge passa-ge 34.
  • the airstream may be induced lto change its direction from one along the axis of rotation 30 of the impeller into one radially outwardly of said axis without the use of curved guiding surfaces to turn the air into the new direction and yet without disturbing the streamline flow of the air yto an extent such as to incur significant losses in performance.
  • the air is therefore turned eiciently in a very small height without occupying the space between the crown 14 and the cowl 31 with guides and the space may be used to house the damper means.
  • the height of the cowl above the trumpet crown 14 also effects the degree of' expansion of the discharging airstream as it passes through the passage 34.
  • the performance of the ventilator may be increased a little by lifting the cowl so that the through flow area at the inlet 35 exceeds the throat area at 17 by an amount somewhat exceeding 33%.
  • the rim of the cowl is raised in relation to the crown 14 of the trumpet and the diameter of the cowl must be increased to maintain theV necessary protection against weather entry.
  • the friction losses are increased. There is therefore a compromise to be reached and for aesthetic reasons a small amount of performance may be sacrificed by keeping the diameter of the cowl as small as possible and allowing the discharging airstream to emerge through the outlet 36 at a slightly higher velocity that might otherwise be contemplated.
  • the ventilator may be designed to operate at a number of fan speeds, the shutter member 43 floating/'freely on the airstream at intermediate speeds but moving to its fully open position as shown in chain dotted outline in FIG. l at the maximum fan speed.
  • the ventilator as described may be used as a wall ventilator and mounted on a vertical wall.
  • the links 45 supporting the non-return shutter flap would be disposed at the top.
  • the section 31 of the trumpet mouthing portion may be formed as an impeller shroud and carried round with the impeller, The section 31 would in this case be carried at the tips of the impeller blades and run closely in a gap or recess formed between adjacent stationary sections of the fan casing.
  • the section 31 and the section of the trumpet mouthing downstream of the section 31 may be formed on and carried round with the impeller as a shroud, a whole -top ring of the trumpet mouthing portion or again, the whole of the trumpet mouthing portion rotating with the impeller.
  • a mixed ow impeller handles more air for a given size and speed than a centrifugal ventilator and handles more air against added resistance upstream of the impeller than a ventilator employing a conventional axial flow fan.
  • Another advantage is that the shallow, frustoconical impeller operating wholly within the mouth of the trumpet allows a single plate, damper member to be used seating on the trumpet flange.
  • Yet another advantage of the construction as described and illustrated is that it facilitates the form of construction in which the impeller is mounted directly on the motor shaft downstream of the motor, so promoting a very squat and unobtrusive outline for the ventilator above the surface of the roof in contrast with the centrifugal design in which the motor is usually mounted inside the weather hood downstream of the impeller.
  • the cowl 32 in the construction of ventilator described with reference to the accompanying drawings may alternatively be circular in plan and likewise, the peripheral edge 15 of the ange 15 may be circular whereby the cowl and the flange have the cross-sectional shape shown in FIG. 1 in all radial planes through the axis 30.
  • the cowl may be hinged to the fan casing so that it may be swung back complete with the damper means to expose the fan motor unit for servicing.
  • an extraction fan motor (16) having a bladed impeller (25, 26, 27) and a fan casing having an air inlet end and an air outlet end said fan being mounted in said casing to rotate said impeller therein, and discharge air from the building,
  • said casing including a trumpet mouth portion extending generally axially of said impeller at the outlet end thereof and daring radially outwardly to extend generally radially thereof remote from said outlet end to form a surface turning generally through a right angle;
  • said impeller being mounted within said outwardly flaring trumpet mouth portion and having blades, the tips of which closely match and conform to the shape of said aring trumpet mouth portion to provide for axial and radial components of air movement over the blade tips, the downstream edges of said impeller blade presenting the largest radial distance of said impeller blades, whereby, in operation of the ventilator, air will be dispersed radially as well as moved axially, so that air leaving the tips of the trailing edges of the impeller blades will have a large amount lof movement radially outwardly thereof imparted thereto.
  • a ventilator as claimed in claim 4 wherein said confronting surfaces are so shaped and disposed in relation to each other that in operation of the ventilator a sheath of air adjacent the peripheral extension of the inner wall surface clings to and flows smoothly along said wall surface so as to turn through sustantially a full right angle along said trumpet mouth without any great loss of energy while that body of air which detaches itself from said wall surface impinges on said generally flat member and flows radially outwardly therealong in all directions,
  • a ventilater as claimed in claim 1 including a generally flat member spaced from the trumpet mouthing portion of the fan casing and presenting a substantially fiat co-extensive surface disposed generally normal to the axis of rotation of the impeller, the trumpet mouthing portion having an inner wall surface which turns through a full right angle; and said surface of said member being ⁇ predetermindly spaced from the crown of the trumpet mouthing portion, to constrain air to ow smoothly round the inner wall surface of the trumpet mouthing portion to the crown thereof without breaking away from the smoothly round surface.
  • a ventilator as yclaimed in claim 3 including means presenting confronting surfaces, one as a peripheral extension of said surface of said member and the other as a peripheral extension of the inner wall surface of the trumpet mouthing portion; said confronting surfaces together defining a confined air discharge passage for streamline flow of the extracted air the through ow area of which progressively increases to an air discharge outlet from said passage to the outside atmosphere.
  • a ventilator as claimed in claim 4 wherein said air discharge outlet is yoffset relative to the inlet to said air discharge passage in the direction of the axis of rotation of the impeller and said confronting surfaces are gently curved between said Ainlet and said outlet -to prevent break away of the discharging airstream therefrom.
  • a ventilator as claimed in claim 4 wherein said generally at member is a cowl of inverted shallow-dished form, said one of said confronting surfaces being formed by the underside of the cowl and said other of said confronting surfaces being formed by an outwardly directed ange portion on the downstream end of the fan casing.
  • a ventilator as claimed in claim 4 wherein said generally flat member is formed by a damper plate mounted for movement between a closed position in which it seats on the trumpet mouthing portion of the fan casing and a fully open position in which it lies against the underside of the cowl.
  • a ventilator as claimed in claim 1 wherein said trumpet mouthing portion, in the region of said impeller, forms a frusto-conical section, said frusto-conical section blending smoothly with an outwardly vcurved section of the trumpet mouthing portion immediately downstream of the tips of the trailing edges of the impeller blades.
  • Ventilator as claimed in claim 1 including a damper plate (41) mounted for movement between a closed position (FIG. 1-full line) in which said plate bears against the trumpet mouth of said casing to 'close off the air passage therethrough communicating with said fan, and an open position (FIG. l-dash dot line) in which said plate is spaced from the axial termination of said casing; means mounting said damper plate for movement between said portions,
  • said damper plate mounting means includes a structural member (32) spaced from the axial termination of said trumpet mouth; a first bracket (56) extending from said member toward said casing;
  • a link (55) rotatably mounted in said bracket at one end thereof and secured to said plate at the other end; said bracket being spaced from the axis of said fan and said link being mounted on said plate at a distance different from the axial spacing of said bracket so that said link will be included with respect to said axis, as well as with respect to a plane perpendicular thereto; and means moveably securing (45, 46, 47, 48, 49) at least one aditional point on said plate to said structural member (32) said movably securing means being resilient in a radial direction with respect to said fan.
  • Ventilator as claimed in claim 10 including spring means (50) biasing said plate mounting means to hold the plate in closed (FIG. l-full line) position.
  • said movable securing means includes a second bracket (48) depending from said structural member (32); a second link (45) connected to said bracket, said second link (45) extending in a direction inclined with respect to the axis of said casing as well as with respect to a plane perpendicular thereto; and a flexible interconnection (46) between said plate and rone of said links (45, 55), said exible interconnection permitting resilient deformation in a radial direction.
  • Ventilator as claimed in claim 12 including spring means biasing at least one of said links ('45, 55) in a direction towards said casing to thus bias said damper plate towards closed position against said trumpet mouth.
  • Ventilator as claimed in claim 10 wherein said structural member is a cowl (32) covering the trumpet mouth opening of said fan casing, said damper plate (41) when in fully open position, bearing against said cowl (32).
  • a discharge ventilator having a casing lirmed with a mouth portion for discharge of air therefrom; a closure means to close Said mouth portion and prevent backdrafts;
  • a structural member located in spaced relationship from said mouth portion mounting said closure means for movement between a closed position, in which said closure means bears against said mouth portion, and an open position in which said closure means is spaced from said mouth portion, resilient means biasing said closure means in closed position, and support link means having one end mounted on the closure means at spaced locations thereof, said support means having their other end mounted on said structural member, said support link means bcing mounted on the structural member by a distance which is less than the length of the links plus the distance between said spaced mounting locations on said closure means to provide an over-center snap action tending to maintain said closure means in closed position.
  • Discharge ventilator as claimed in claim 15, at least one of said links yieldingly interconnecting said structural member and said closure means to permit said closure means to pass through the in-line position under pressure of discharge'of air from said mouth portion.
  • Discharge ventilator as claimed in claim 15, wherein said structural member is a bridge member spanning said mouth portion; brackets are provided secured to said bridge member; and said link means comprising support links having one end of said support links mounted on said brackets; said brackets being located diametrically opposite with respect to said mouth portion, and said links being of equal effective length, whereby said closure means, when in open position, will be parallel to said closure means when in closed position.
  • Discharge ventilator as claimed in claim 15, said mouth portion being formed as a haring, trumpet-shaped mouth; and fan means disposed Within said mouth portion to discharge air therefrom in a direction towards said closure means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US551118A 1965-05-19 1966-05-18 Ventilators Expired - Lifetime US3386368A (en)

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GB21120/65A GB1151191A (en) 1965-05-19 1965-05-19 Improvements in or relating to Ventilators

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US3826183A (en) * 1973-01-02 1974-07-30 K Rudine Motor-powered self-opening and closing ventilators
USD259951S (en) 1979-06-11 1981-07-21 Briedert George M Ventilator
USD310874S (en) 1988-09-14 1990-09-25 Utley Jr James E Solar powered roof vent fan
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US5387151A (en) * 1992-08-03 1995-02-07 Lyemance International, Inc. Top sealing chimney cap
US5505587A (en) * 1995-01-05 1996-04-09 Northrop Grumman Corporation RAM air turbine generating apparatus
US20100136897A1 (en) * 2006-09-15 2010-06-03 Bookyu Lee ventilation cover with a light source
US20160146222A1 (en) * 2014-11-21 2016-05-26 Airius Ip Holdings, Llc Air moving device
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US10024531B2 (en) 2013-12-19 2018-07-17 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US10221861B2 (en) 2014-06-06 2019-03-05 Airius Ip Holdings Llc Columnar air moving devices, systems and methods
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USD259951S (en) 1979-06-11 1981-07-21 Briedert George M Ventilator
USD310874S (en) 1988-09-14 1990-09-25 Utley Jr James E Solar powered roof vent fan
US5295901A (en) * 1992-08-03 1994-03-22 Lyemance International, Inc. Top sealing chimney cap
US5387151A (en) * 1992-08-03 1995-02-07 Lyemance International, Inc. Top sealing chimney cap
US5437574A (en) * 1992-08-03 1995-08-01 Lyemance International, Inc. Top sealing chimney cap
US5505587A (en) * 1995-01-05 1996-04-09 Northrop Grumman Corporation RAM air turbine generating apparatus
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US20100136897A1 (en) * 2006-09-15 2010-06-03 Bookyu Lee ventilation cover with a light source
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US11598539B2 (en) 2019-04-17 2023-03-07 Airius Ip Holdings, Llc Air moving device with bypass intake
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GB1151191A (en) 1969-05-07
NL6606829A (cs) 1966-11-21
BE681270A (cs) 1966-10-31
DE1628226B2 (de) 1975-11-27
NL152972B (nl) 1977-04-15
DE1628226A1 (de) 1971-02-04

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