Ventilators

Sept 10, 1957

2,805,615

E. RUDY

VENTILATORS

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E. RUDY

VENTILATORS

Sept. 10, 1957

Filed Oct. 4, 1954

2,805,615

Sheets-Sheet 2

<img file="US2805615A_D0003.tif" />

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2,805,615

E. RUDY

VENTILATORS

Sept. 10, 1957

Filed Oct. 4, 1954

Sheets-Sheet 3

<img file="US2805615A_D0005.tif" />

<img file="US2805615A_D0006.tif" />

<img file="US2805615A_D0007.tif" />

Sept. 10, 1957

2,805,615

E. RUDY

VENTILATORS

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<img file="US2805615A_D0009.tif" />

EMIL RUDY

United States Patent Office 2305,615

Patented Sept. 10, 1957

2,805,615

VENTILATORS

Emi! Rudy, Cleveland, Ohio, assignor to Loren Cook Company, a corporation of Ohio

Application October 4,1954, Serial No. 459,903

Claims. (Cl. 98--43)

This invention relates to ventilators and more particu_f larly to a ventilator which is adapted to be installed in a wall or upon the roof of a building to remove heated air, or air contaminated with smoke, dust, fumes, and odors, from the interior of the building or from rooms or ϊ offices therein.

It is now customary to provide ventilators for removing smoke and dust from high class factories and the offices therein, or excess heat, fumes, and odors from homes and restaurants, and particularly the kitchens thereof, and it is an object of the present invention to provide an improved ventilator of this type which is neat in appearance and which may be inserted in an opening in a.side wall or around a pipe extending through an opening in the roof of the building and which is so constructed that heated air or air contaminated with dust, smoke, or fumes, may be efficiently and quietly drawn from the interior of such rooms or buildings.

Another object of the invention is to provide, an improved ventilator including air moving means, such as an impeller or blower, for quietly and efficiently withdrawing air from buildings or rooms therein and in which means are provided for permitting a portion of the air which is substantially free from contamination to flow into contact with a motor for driving the air moving means.

, A further object of the invention is to provide a ventilator including a motor in which improved means are provided, for protecting the motor and the interior of the ventilator from weather elements, such as rain or snow, without in any manner detracting from the appearance of the ventilator or its efficiency in quietly drawing air from the interior of a room or building.

A still further object of the invention is to provide an improved ventilator including a motor which is so constructed that air contaminated with smoke, dust, fumes, and odors, may be withdrawn or expelled from a building or rooms therein and in which improved means are provided for drawing air from the atmosphere into contact with the motor while the contaminated air is being withdrawn from the building.

_z The invention will be better understood by reference * to the accompanying drawings in which:

Fig. 1 is a side elevational view of one form of the ventilator showing it attached to the side wall of a building, which building is shown in section with parts broken away;

Fig. 2 is a central cross sectional view of the ventilator shown in Fig. 1;

Figs. 3 and 4 are cross sectional views taken on planes passing through the lines 3—3 and 4—4, respectively, of Fig. 2, looking in the direction of the arrows;

Fig. 5 is a view partly in elevation and partly in cross section of another form of the ventilator, showing it secured to the side wall of a building which building is shown in section with parts broken away;

Fig. 6 is a cross sectional view taken on a plane passing through the line 6—6 of Fig. 5, looking in the direction of the arrows;

Fig. 7 is a view partly in elevation and partly in section of another form of the ventilator; and

Fig. 8 is a sectional view taken on a plane passing through the line 8—8 of Fig. 7, looking in the direction of the arrows.

While the ventilators of the present invention are adapted to be applied around pipes extending through the 10 wall of a building or through openings in any part of a building, as shown in Fig. 1 to 4 of the drawings, the ventilator is applied to a side wall 1 and includes conduit means 2 arranged in an opening in the side wall of a building, an extension collar 3, a grid 4 secured to the 16 extension collar and arranged within the building, an annular wall 5 having an outwardly flared portion, an annular supporting wall 6, an annular air directing and protective shield or baffle 7, a motor 8, air moving means 9, a plate 10 for supporting the motor, and a hood or . 20 cap 11 for protecting the motor from weather elements, such as rain or snow.

For securing the ventilator to the wall of a building, the annular supporting wall 6 is provided with an annular flange 12 extending outwardly from the axis of the ven25 tilator which has spaced apertures therein for receiving screws or bolts 13 which may be threaded into wall 1 of the building. The supporting wall 6 is inclined outwardly from the wall of the building and inwardly relative to the axis of the ventilator and is provided with a ra30 dially extending annular flange 14 and means associated with flange 14, plate 18, and hood 11, are provided for supporting motor plate 19 in spaced relation to wall 6 and- hood 11. For this purpose, a plurality of spaced threaded bolts 15 are provided, each of which extends 35 through aligned apertures in a radially extending annular flange 16 on the inner portion of hood 11, the plate 19, a radially extending portion of wall 5, and the flange 14 of wall 6, and is held in place by a nut 17 arranged outwardly of and engaging flange 16 of the hood and a 40 second nut 17α arranged inwardly of and engaging flange 14 of the supporting wall, and for spacing hood 11 from plate 10 to provide an annular opening between the motor plate and flange 16 of hood 11 through which air may flow into contact with the motor, a spacer 18 surrounds 45 each bolt 15 between flange 16 and plate 10, and for maintaining plate 10 in spaced relation to supporting wall 6, a second spacer 19 surrounding each bolt is arranged between plate 10 and the radially extending portion of wall 5.

The blower or impeller consists of a circular plate 20 having a depression 20α therein for strengthening purposes and secured to the outer margin of plate 20 by suitable means, such as welding or by screws as shown more particularly in Fig. 8, are a plurality of vanes 21 55 which are arranged in spaced relation to each other and are inclined relative to a plane passing through the central axis of the ventilator as shown more particularly in Fig.

4. The number of vanes will of course depend upon the size of the ventilator. For small ventilators utilized in 60 kitchens and restaurants, twelve vanes are usually sufficient.

The impeller or blower 9 is rotated by means of the motor 8 which is mounted upon plate 10 in any suitable manner. As shown, a plurality of bolts 22 secured to 65 the motor extend through apertures in the plate and are secured thereto by nuts 22α. The motor is also secured to plate 20 of the air moving means and for this purpose the shaft of the motor extends through an aperture in the motor plate 10 and an aperture in plate 20 of the 70 air moving means and is threaded to receive a nut 23.

As shown in Figs. 1 to 4, a damper 24 is arranged in conduit means 2. While the damper 24 may be pivotal2,805,616 and the inner end of which extends through apertures in walls 5 and 6 and terminates in a connector 38 arranged within a chamber 39 formed by walls 5 and 6 and suitable conduit means 40 extends through an opening in wall 1, the outer end of which is secured to connector 38. To prevent the passage of tube 37 through apertures in plate 10 and walls 5 and 6, suitable nuts or collars. 41 and 42 are provided, collar 41 being in engagement with the motor plate 10 and collar 42 being in engagement with the outer side of wall 5. ..,

In the construction shown, when motor 8 is energized, it rotates the blower including vanes 21 and air is drawn through grid 4 and conduit means 2, the force of which moves damper 24 to its partly or fully open position, depending upon the speed of the motor, and it is then forced by vanes 21 as indicated by the arrows A. against the curved portion of wall 5 which, deflects the air outwardly against the flaring portion of wall 5 and between baffle 7 and hood 11 to the atmosphere in a quiet and efficient ¹ manner. The motor of course will be heated to a certain extent during operation and a portion of that stratum of the air which is adjacent the annular opening 43 between flange 16 of hood 11 and the peripheral flange on plate 10 will flow around motor 8 which will be cooled i thereby. It will be noted that the rapid rotation of the vanes will throw the dust and other solid particles outwardly against the inner surface of the curved portion of wall 5 and consequently that portion of the air which flows around the motor will be comparatively free from &gt; dust and other solid particles.

The inner supporting wall 6, the outwardly flaring portion of wall 5, and baffle 7 as thus arranged for directing air outwardly from the ventilator also serve to protect the motor and the interior portion of the ventilator from 5 weather elements, such as rain or snow. It will be noted that the inner supporting wall 6 and the curved portion of wall 5 meet at an acute angle to provide a valley 44 so that rain falling against the outer side of the curved and flaring portions of wall 5 or upon the supporting wall 6, or water formed by the melting of snow or ice deposited thereon, will flow into the valley 44 and will drain from the lower portion of the ventilator and to prevent water from, seeping between the supporting wall “ inwardly extending bead 45 is provided on wall 6 inwardly of the junction point of walls 5 and 6 in which a calking compound 46 may be inserted, and if desired, walls 5 and 6 may be welded together adjacent the bead 45 as indicated by: the numeral 45α. Rain falling upon, or water formed from melting snow or ice deposited on the upper outer surface of hood 11, will drain outwardly, and downwardly over the hood and in a like manner rain falling upon or water formed from melting snow or ice deposited on the outer upper surface of baffle 7 will drain on to hood 11, the outer portion of which hood is substantially flat- to enable water to drain therefrom. Any rain or water formed from snow or ice which is deposited by: gusts of wind on the inner surface of baffle 7 will of course drain downwardly around the inner surface of the baffle and will escape through the annular opening 47 between the baffle .7 and the outwardly flaring portion of walls.

The conduit means 2 is of sufficient length to fit within the walls of minimum thickness and the collar 3 is adjustable inwardly when the wall is of greater thickness. For securing the collar 3 and the grid 4 in place, the collar is.provided with a flange 47α extending axially outwardly from the collar and in a like manner the grid 4 is provided with an annular flange 48 extending outwardly from, its axis, the peripheral portion of which is turned outwardly as indicated by the numeral 49 to obscure the flanged end of the collar and the collar and grid may be secured to the inner side of the building wall by suitable ³ .

ly supported in conduit means 2 in any desirable manner, as shown, a collar 25 which may be welded or otherwise secured to conduit means 2 has an inwardly extending annular flange 26 providing an opening and a pintle 27 extending through knuckles formed on adjacent portions. of ' the damper has oppositely extending end portions pivotally mounted in bosses 28 extending inwardly from collar 25. The damper is pivotally mounted at points on the collar which are spaced radially outwardly a considerable distance from the central axis of the ventilator and the lower portion of the damper which is arranged between the pivot points and the adjacent wall is provided with a weight 29 which urges the damper to its closed position when the ventilator is idle. When the motor is energized, however, and the blower is rotated, the .damper is moved to a partly or fully open position depending upon the speed at which the motor is rotated. In Fig. 1, the damper is shown in full lines in its closed position and in dotted lines in its partly open position.

In accordance with the present invention, the wall 5, the outer periphery of the motor plate, baffle 7, and hood 11, : are so arranged that air drawn from the interior of the building or from rooms or offices therein, may be quietly and efficiently expelled to the atmosphere. As illustrated in Fig. 2, conduit means 2 terminates inwardly of wall 1 and wall 5 is provided with an inwardly extending annular flange 30 which surrounds and is held in place by the outer end portion of conduit means 2 to which it may be secured by suitable means, such as welding. The annular wall 5 extends outwardly from wall 1 and to build up pressure and to avoid air turbulence, at the inlet of the blower or impeller, wall 6 is provided with an annular inwardly curved or arcuate-shaped portion 31 into which the inner ends of vanes; 21 extend, and to deflect and guide the air through the ventilator and to prevent turbulence, wall , 5 is provided with a portion which is curved outwardly relative to the axis of the ventilator. Wall 5 is also provided with a radially extending portion 33 which overlies flange 14 of wall 6 and is apertured to receive the bolts 15 extending through spacers 18 and 19, or, if desired, the aperture in wall 5 may be of sufficient size to receive the lower end portion of spacer 19. It is not necessary, however, that the outer periphery of wall _r------- ------------- . ~

5: shall extend beyond plate 10. To further direct the .. 6 and the outwardly flaring portion of wall 5, an annular path of the air and to prevent the entrance of rain or ⁴⁰ nrnvided on wall 6 inwardsnow into the motor compartment formed by the hood 11, the periphery of the motor plate 10 is curved outwardly from wall! as indicated by the numeral 34 and the periphery of flange 16 of hood 11 is curved inwardly as indicated by the numeral 35.

The baffle 7 and the hood 11 are arranged in such relation to each other that the contaminated air will be expelled quietly and efficiently from the interior of a room or building without । turbulence. For this purpose, __gthe annular shield or baffle 7 is spaced from the flaring wall 5 and is curved outwardly relative to wall 1 and inwardly relative to the axis of the ventilator. Hood 11 also extends outwardly and is inclined inwardly toward the axis of the ventilator. 60

The shield or baffle ? is formed separately from wall 5 and is supported in position in any desired manner. As shown, a plurality of spacers 36 are arranged between .the outer end portion of wall 5 and the inner portion of shield or baffle 7 which are secured in place by suitable means, such as bolts 36α, each of which extends through a central opening in each spacer. It will.be noted that by removing bolts 36α and nuts 17, the baffle and hood may be removed to provide access to. the motor for cleaning or oiling it or for making repairs thereon.

To enable the motor to be energized, conduit means are provided through which electrical conductors may be passed from the interior of the building to the motor 8. As shown, the conduit means includes a tube 37, the out- -----_: ---. - ., er end of which extends through an aperture in plate 10 75 means, such as screws 50. The gnd 4 has an ornamental

2,805,616 ⁵appearance and is so constructed that it will cause a uniform distribution of the air through the conduit means 2.

Another modification of the ventilator is shown in Figs. 5 and 6. of the drawing which is somewhat similar to that shown in Figs. 1 to 4 and corresponding parts have accordingly been designated by the same reference numerals as shown in Figs. 1 to 4. In this modification, however, the motor plate consists of a dish-shaped member having a bottom wall 51 on which the motor 8 is mounted and an annular side wall 52 which is inclined outwardly from wall 1 and from the axis of the ventilator and terminates in. a substantially radially extending portion 53 provided with spaced apertures to receive bolts 54 as shown in Fig. 6 of the drawings, each of which bolts also extends through aligned apertures in the flange 55 of the hood or cap 56 and the radially extending portion 33 of wall 5. The spacing tubes 18 and 19 are similar to those shown in Figs. 1 to 4. In this modification, however, each spacing tube 19 extends through an aperture in the radially extending portion 33 of wall 5 and each bolt 54 extends through aligned apertures in flange 55 of hood 56, the radially extending portion 53 of the motor plate, and the radially extending portion 14 of wall 6 and is secured in place by means of a nut 17 which engages flange 55 and a nut 17α which engages the radially extending por- 25 tion 14 of wall 6.

In the modification shown in Figs. 5 and 6, the shield or baffle 57 extends downwardly over the outwardly flaring portion of wall 55 and is maintained in spaced rela- .....

one end of each of which is provided with an aperture through, which one of the bolts 54 extends and which is held in place adjacent the radially extending portion 53 of the motor plate by means of one of the spacers 59. „ _1u any _0LUI

Each of the straps is then inclined inwardly relative to 35 _welding. Supporting wall 63 wall 1. and outwardly relative to the axis of the ventilator as indicated by the numeral 59 and then extends inwardly in a direction substantially perpendicular to wall 1. The inner portion of baffle 57 is substantially perpendicular to secured to the baffle by suitable means, such as a bolt *60.

In the ventilator shown in Figs. 5 and 6, it is anparent that the weight of motor 7, the hood 56, and the baffle or shield 57, is borne by supporting wall 6 and conse- _{tu cavu ulucr ror τη1&lt;ζ ηι1ΓηηςΡ}^{1S dangerihai the} outwardly flaring wall 45 hood 65 is provided with an outwardly extending annular 56. will be forced out of alignment with conduit 2. The _r —..... -- - oimuuu axis of the motor, the blower, and the hood will therefore always be maintained in alignment with the axis of the conduit means 2. Because the inner portion of baffle 57 i also be apparent that rain falling against the inner portion of the outer surface of baffle 57 and the outer surface of wall 6 will drain into the valley 44 and will flow to the bottom of the ventilator. Rain carried by gusts of uvuwiui »» a wind or water formed by the melting of any snow or ice 55 in flange 82 and deposited on the inner surface of baffle 57 will drain off '' ' through the annular opening between baffle 57 and wall 56 and rain falling against or water formed by the melting of snow or ice deposited upon the outer surface of the _u m outer portion of baffle 57 will flow upon hood 56 and will 60 a first series of tubular porting wall 63, a motor 64, a hood or cap 65 for the motor, an annular baffle or shield 66, and air moving means 67, such as an impeller or blower.

The blower includes a plate 68 having a depressed central portion 68a for strengthening purposes, and a plurality of vanes 69 which are secured to the peripheral margin of plate 68 by suitable means, such as screws 70, and is rotated by means of a motor 64 to which it may be secured by any suitable means. As shown, motor 64 is mounted upon a plate 71 arranged outwardly of plate 68 and is provided with a shaft 72 which extends through apertures in plates 71 and 68 and is threaded to receive a nut 73.

T° prevent air from the outside atmosphere from entering the building when a circuit to the motor is interrupted, damper means are provided in conduit 61. The damper means consists of a collar 74 which may be welded or otherwise secured to the interior of conduit means 61 and from which extends an annular rib 75 forming an opening and a damper 76 is provided to which is secured a pintle 77, the opposite ends of which are mounted in bosses extending inwardly from the collar at a substantial distance outwardly from the axis of the conduit means as shown more particularly in Fig. 6 of the drawing, and means are provided for maintaining the damper in closed position when the electrical circuit to the motor is interrupted. For this purpose, a stop 78 secured to rib 75 is provided which prevents the shorter end portion of the damper from moving upwardly beyond the rib 75 and a .► ,·&lt; ~ , _, ^c v* utxxxj-z v-x xiuiii iiiuviiig Ll jJ w di Lil V L/OVO-llU. Lxl&amp; Πυ / *5 cLIlCl cL tion thereto by means of a plurality of spaced straps 58, 30 weight 79 is secured to the opposite end of the damper one end nr earn nf which IP T-»fZ^xziz4orl ττζί+1-k . ·,. t -. ..

for urging it to closed position.

The annular supporting wall 63 is provided with an annular flange 80 which surrounds conduit means 61 and is secured thereto in any suitable manner, such as by ~ -3 is also provided with an annular curved or arcuate-shaped portion 81 which forms an annular recess into which the lower ends of vanes 69 of the blower extend to provide a pressure area between the conduit means 61 and the vanes of the blower when -------- The upper portion of wall 63 terminates in an outwardly extending flange 82 and means associated with flange 82, plate 71, air deflector 66, and hood 65, are provided for maintaining them in spaced relation to each other. For this purpose, the portion 83 which is substantially flat and which has spaced apertures therein, the air deflector 66 is provided with a substantially annular portion 84 having spaced apertures^ therein, the outer periphery of plate 71 and ,,-------„ —1 are each provided. with a plurality of spaced apertures, and each aperture in flange 83 of the hood is in alignment with an aperture in the outwardly extending portion 84 of the air deflector 66, an aperture in plate 71, and an aperture ~~d a series of threaded bolts 85 are provided, each of which extends through each series of aligned apertures, the upper end of each bolt being secured in place by means of a nut 86 and the lower end of each bolt being secured in place by means of a nut 87, and *. spacing members 88 are provided, each of which surrounds one of the bolts 85 and is arranged between, flange* 83 and the outwardly extending portion 84 of air deflector 66, and in a like manner, a second series of tubular spacing members 89 are proportion of 65 vided, each of which surrounds one of the bolts and is - arranged between plate 71 and the flat portion 84 of the air deflector, and a third series of tubular spacing members 90 are provided, each of which surrounds a bolt 85 and is arranged between plate 71 and the flange 82 70 of supporting wall 63.

The air deflecting means 65 is so constructed that air contaminated with dust, smoke, and fumes, may be quietly and efficiently expelled from a room or building For this purpose, the air deflector is provided with an „ . _r ' X --X·--------— uiv Vv/imuu Hicaus 61 fcUJLU Li wall 1 and the inwardly extending portion of each strap is &lt;0 blower is being rotated. Q ΑΓ*117Ά14 +r\ ο 1*.ο-ί-Ώ a l»tr πικ'+αΙ»!,. — -1. _ _ _ 1 1, ,&lt;-.·&gt; _ _ . ®

1 . ,. ,, ,. *-------—-------. «.pvxi.UJ.vo IUCAC1U, LUC UlllCr ΡνίΓΟΠείν Οί is arranged substantially perpendicular to wall 1, it will 50 annular flange 82 of the supporting wall also be annare.nt that ram falling a&lt;rainc« +R» .., , ... . »«u drain therefrom and in a like manner rain or water formed from melting snow or ice. deposited upon the upper surface of hood 56 will flow on to the flat outer end portion of the hood and will drain therefrom. In this modification, it will be noted that the outer ___ baffle 57 extends outwardly to a distance which approximates the outer end portion of the hood so that the interior portion of the ventilator will be substantially protected against the entrance of weather elements, such as snow, rain, or ice.

Another modification of the invention is shown in Figs. 7 and 8. of the drawings which is particularly designed for application to the roof of a building around a pipe extending through the roof; As shown, the ventilator comprises conduit means 61, a base 62, an annular, sup- ₇₅ annular curved portion 91 to deflect the air downwardly through which air is directed by said air moving means, an annular baffle extending outwardly from the flaring portion of said wall relative to said building for protecting the interior of the ventilator from weather elements and said baffle being spaced outwardly from, said hood relative to the axis of said ventilator but being curved inwardly toward the tapered portion of the. hood for directing air passing between the flaring portion of the air directing wall and the motor supporting plate away from said building between said baffle and hood, and means for supporting said baffle in place.

2. Apparatus as defined in claim 1 in. which the means for supporting the baffle in place consists of a plurality of straps, one end of each of which is connected to the motor supporting plate and the other end of each of which is connected to said baffle.

3. Apparatus as defined in claim 1 in which a portion of said baffle is arranged in proximity to but is .spaced outwardly from the flaring portion of the air directing wall relative to the axis of the ventilator to.permit rain and water formed from melting snow and ice which is deposited on the inner side wall of the baffle to flow between the baffle and the outwardly flaring portion of the air directing wall. .

4. Apparatus as defined in claim 2 in which .said baffle has an inner portion arranged in spaced relation to the outwardly flaring portion of the air directing wall and in which the means for supporting the baffle in place consists of a plurality of connectors, each of which extends through the baffle and the outwardly flaring portion of said wall and in which means associated with each connector is provided for maintaining the inner portion of the baffle in spaced relation to the outwardly flaring portion of said wall.

5. A ventilator for application to a building having an opening therein, said ventilator comprising conduit means disposed in said opening, a wall having an annular flange surrounding the outer end portion of said conduit means and an annular portion which is flared outwardly relative 40 to said building, a circular motor supporting plate spaced outwardly from the building, a motor supported by said plate and extending outwardly therefrom relative to the building, a hood for said motor having an annular portion which is tapered inwardly relative to the axis of the ventilator and outwardly relative to the building and an ⁴⁵ inner annular flange arranged in parallel relation with a portion of said plate, means for supporting and maintaining the motor supporting plate at a predetermined distance from said wall, air moving means arranged inwardly of the motor supporting plate relative to the ⁵⁰ building, means for operatively securing the motor.to said air moving means, and the flaring portion of said wall being spaced outwardly relative to the axis of the ventilator at a sufficient distance from the periphery of said plate to provide a path between said plate and the flar⁵⁵ ing portion of said wall through which air is directed by said air moving means away from the building, and means for supporting said hood in spaced relation to said motor supporting plate to provide an annular opening between the flange of said hood and said plate through ⁶⁰ which a portion of the stratum of. air directed outwardly from the ventilator passes to cool the motor.

6. Apparatus as defined in claim 5 in which the hood is spaced from the motor to form a motor compartment and in which the peripheral portion of the motor sup⁶⁵ porting plate is curved outwardly relative to the_; building so that the air will be passed outwardly away from the building between the curved peripheral portion of the motor supporting plate and the flaring portion of the ₇₀ wall without turbulence and in which the outer periphery of the flange of said hood is curved inwardly toward the outwardly curved portion of the motor supporting plate to prevent rain and other weather elements from passing into the motor compartment.

Ϊ4 7. A ventilator for application to the side wall of a

2,808,6 _Λ and to provide a large outlet area, the lower portion 92 bi the deflector is curved outwardly. It will thus be apparent that when a circuit to the motor is established and the blower is rotated, a low pressure area is created in the ventilator and damper 76 is moved to its open or 5 partly open position as shown in dotted lines and contaminated air from the interior of the building, or from Offices or rooms therein, is drawn into conduit means 61 and is forced outwardly by the blower. The air passing outwardly through the blower is deflected downwardly iv by the curved portion 91 of the deflector and is then passed outwardly through the flaring portion 92. The path of the air stream is indicated by the arrows B.

The force of the air moving outwardly and downwardly . also creates an area of low pressure around motor 64 and 1» air from the atmosphere is drawn inwardly through the annular opening 93 between hood 63 and the flat portion 84 of the deflector and for directing the air in contact with the motor, the upper end of the deflector extends inwardly as indicated by the numeral 94 and then upwardly and is provided with an arcuate-shaped annular portion 95, the outer end portion of which terminates in a cylindrical wall 96 which surrounds motor 64. When the blower is in operation, the air is therefore drawn inwardly through annular opening 93 and passes upwardly between the hood and the portion 95 and wall 96 of the deflector and flows into contact with and cools the motor 64. It then flows downwardly and is deflected outwardly by the arcuate-shaped portion 95 of the deflector and by the motor plate 71, the periphery of which has a down- ^uwardly and outwardly curved portion 97 to prevent turbulence. The path of the air drawn in through the annular opening 93 and its passage between hood 65 and wall 96 and between wall 96 and motor 64 is designated by the arrows C. . .

To prevent rain or snow from being drawn inwardly around the motor, the outwardly extending periphery of flange 83 is also curved downwardly as indicated by the numeral 83α. The upwardly extending portion and the cylindrical wall 96 of the deflector also prevent ram or snow from being drawn into contact with the motor.

The base 72 of the ventilator is provided with an upwardly inclined portion 98 which terminates in an annular collar 99 which may be secured to conduit means 61 in any desirable manner, such as by welding, and the lower portion of the base terminates in an annular flange 100. The curved portions .98 and 100 prevent water from settling on the base of the ventilator.

Conduit means are also provided for leading electrical conduits to the motor. For this purpose, pipe 101 is provided which is secured to the base by nuts 102 and 103. The pipe passes through an aperture in flange 82 and is'secured by nuts 104 and 105 to the motor plate 71.