Patent Abstract:
Air moving device includes a housing, an impeller in the housing for generating a downward air flow, and vanes in the housing in close proximity to and a selected distance below the impeller to straighten the air flow. The device produces an air flow that substantially remains in a column over a substantial distance. The method includes producing an air flow that substantially remains in a column over a substantial distance and directing the air flow from the ceiling towards the floor to provide temperature destratification of the air in an enclosed space. The method also includes directing warm air from the ceiling to the floor and storing heat in the floor, apparatus on the floor and ground under the floor. The stored heat is released when the ceiling is cooler than the floor.

Full Description:
[0001]     This application claims the benefit under 35 U.S.C. § 119(e) of the U.S. provisional patent application No. 60/553,720 filed Mar. 15, 2004. 
     
    
     TECHNICAL FIELD  
       [0002]     The present invention relates to heating, ventilating and air conditioning air spaces, and more particularly to systems, devices and methods for moving air in a columnar pattern with minimal lateral dispersion that are particularly suitable for penetrating air spaces and air temperature de-stratification.  
       BACKGROUND ART  
       [0003]     The rise of warmer air and the sinking of colder air creates significant variation in air temperatures between the ceiling and floor of buildings with conventional heating, ventilation and air conditioning systems. Such air temperature stratification is particularly problematic in large spaces with high ceilings such as warehouses, gymnasiums, offices, auditoriums, hangers, commercial buildings, and even residences with cathedral ceilings, and can significantly decrease heating and air conditioning costs. Further, both low and high ceiling rooms can have stagnant or dead air. For standard ceiling heights with duct outlets in the ceiling there is a sharp rise in ceiling temperatures when the heat comes on.  
         [0004]     One proposed solution to air temperature stratification is a ceiling fan. Ceiling fans are relatively large rotary fans, with a plurality of blades, mounted near the ceiling. The blades of a ceiling fan have a flat or airfoil shape. The blades have a lift component that pushes air upwards or downwards, depending on the direction of rotation, and a drag component that pushes the air tangentially. The drag component causes tangential or centrifugal flow so that the air being pushed diverges or spreads out. Conventional ceiling fans are generally ineffective as an air de-stratification device in relatively high ceiling rooms because the air pushed by conventional ceiling fans is not maintained in a columnar pattern from the ceiling to the floor, and often disperses or diffuses well above the floor.  
         [0005]     Another proposed solution to air temperature stratification is a fan connected to a vertical tube that extends substantially from the ceiling to the floor. The fan may be mounted near the ceiling, near the floor or in between. This type of device may push cooler air up from the floor to the ceiling or warmer air down from the ceiling to the floor. Such devices, when located away from the walls in an open space in a building, interfere with floorspace use and are not aesthetically pleasing. When confined to locations only along the walls of an open space, such devices may not effectively circulate air near the center of the open space. Examples of fans connected to vertical tubes are disclosed in U.S. Pat. No. 3,827,342 to Hughes, and U.S. Pat. No. 3,973,479 to Whiteley.  
         [0006]     A device that provides a column of air that has little or no diffusion from the ceiling the floor, without a vertical tube, can effectively provide air de-stratification. U.S. Pat. Nos. 4,473,000 and 4,662,912 to Perkins disclose a device having a housing, with a rotating impeller having blades in the top of the housing and a plurality of interspersed small and large, vertically extending, radial stationary vanes spaced below the impeller in the housing. The device disclosed by Perkins is intended to direct the air in a more clearly defined pattern and reduce dispersion. Perkins, however, does not disclose the importance of a specific, relatively small gap between the impeller blades and the stationary vanes, and the device illustrated creates a vortex and turbulence due to a large gap and centrifugal air flow bouncing off the inner walls of the housing between the blades and vanes. Perkins also discloses a tapering vane section. The tapering vane section increases velocity of the exiting air stream.  
         [0007]     A device with a rotary fan that minimizes the rotary component of the air flow while maximizing the axial air flow quantity and velocity can provide a column of air that flows from a high ceiling to a floor in a columnar pattern with minimal lateral dispersion that does not require a physical transporting tube. Such a device should reduce the energy loss by minimizing the rotary component of the air flow, and therefore minimizes turbulence. Such a device should minimize back pressure, since a pressure drop at the outlet of the device will cause expansion, velocity loss and lateral dispersion. The device should have minimum noise and low electric power requirements.  
       DISCLOSURE OF THE INVENTION  
       [0008]     An air moving device which has a housing with an air inlet and an air outlet spaced from the inlet. A rotary impeller with a plurality of blades is mounted in the housing at the air inlet end and produces air flow with an axial component and a rotary component. A plurality of spaced, longitudinally extending, radial air guide vanes in the housing downstream of the impeller are in close proximity to the impeller blades to minimize the rotary component and change the air flow to a laminar and axial flow in the housing that exits the outlet end in a columnar pattern with minimal lateral dispersion. A method of moving air includes producing an air flow through a housing, and directing the air flow through the housing in a laminar and axial flow and exits an outlet so as to produce a columnar pattern with minimal lateral dispersion. The method also includes directing warm air from near the ceiling toward the floor, allowing the heat from the warm air to be stored in the floor, articles on the floor and the earth under the floor. The method includes directing air in a generally horizontal direction to allow penetration of an air space in a container, trailer truck or a room to promote flushing of that air space and circulation thereof. The device and method are particularly suitable for high efficiency, low power usage, air temperature de-stratification, and to improve air quality and circulation. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]     Details of this invention are described in connection with the accompanying drawings that bear similar reference numerals in which:  
         [0010]      FIG. 1  is a top perspective view of an air moving device embodying features of the present invention.  
         [0011]      FIG. 2  is a side elevation view of the device of  FIG. 1 .  
         [0012]      FIG. 3  is a bottom view of the device of  FIG. 1 .  
         [0013]      FIG. 4  is an exploded perspective view of the device of  FIG. 1 .  
         [0014]      FIG. 5  is a sectional view taken along line  5 - 5  of  FIG. 2 .  
         [0015]      FIG. 6  is a sectional view taken along line  6 - 6  of  FIG. 2 .  
         [0016]      FIG. 7  is a sectional view taken along line  5 - 5  of  FIG. 2 , with straight upstream portions of the vanes.  
         [0017]      FIG. 8  is a side elevation view of the device of  FIG. 1  showing angular direction of the device.  
         [0018]      FIG. 9  is an enlarged, partial exploded view of the hangar attachment of the device of  FIG. 1 .  
         [0019]      FIG. 10  is a side view of a room with the device of  FIG. 1  showing an air flow pattern with dashed lines and arrows.  
         [0020]      FIG. 11  is a side elevation view, partially cut away, showing the device of  FIG. 1  modified for attachment to a light can.  
         [0021]      FIG. 11A  is a sectional view taken along line  11 A- 11 A of  FIG. 11 .  
         [0022]      FIG. 12  is a side elevation view of the device of  FIG. 1  with an intake grill.  
         [0023]      FIG. 13  is a sectional view taken along line  6 - 6  of  FIG. 2  of the device of  FIG. 1  with a misting nozzle.  
         [0024]      FIG. 14  is a side elevation view of the device of  FIG. 1  in combination with a tube and second air moving device.  
         [0025]      FIG. 15  is a bottom perspective view, partially cut away, showing the device of  FIG. 1  mounted in a drop ceiling.  
         [0026]      FIG. 15A  is a top perspective view of  FIG. 15 .  
         [0027]      FIG. 15B  is a top perspective view of the fastening member shown in  FIG. 15A   
         [0028]      FIG. 15C  is a sectional view taken along  FIG. 15C-15C  of  FIG. 15A .  
         [0029]      FIG. 15D  is a sectional view along line  15 D- 15 D of  FIG. 15A .  
         [0030]      FIG. 16  is an enlarged view of a portion of  FIG. 15 .  
         [0031]      FIG. 17  is a side elevation view, partially cut away, showing the device of  FIG. 1  modified for attachment to a light socket and having a light bulb at the lower end.  
         [0032]      FIG. 18  is a schematic view of an open sided tent with an air moving device in the top.  
         [0033]      FIG. 19  is a schematic view of a shipping container with an air moving device at one lower end. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0034]     Referring now to FIGS.  1  to  9 , there is shown an air moving device  12  having an elongated outer housing  13 , an electric rotary fan  14  in the housing for producing air flow in the housing and a plurality of longitudinally extending, outer radial vanes  15  and an inner housing hub  16  opposite the vanes in the housing downstream of the fan for directing air flow in the housing.  
         [0035]     The housing  13  has a circular cross section, and an open first end  17  and an open second end  18  spaced from the first end  17 . In the illustrated embodiment, a detachable, axially outwardly convex cowling  19  forms the first end  17  and provides an air inlet  21  with a diameter slightly smaller than the outer diameter of the cowling  19 .  
         [0036]     The housing  13  has a first section  25  extending from the cowling  19  to an interior shelf  26 . A generally C-shaped hanger  23  mounts at opposite ends  24  to opposite sides of the housing  13  at the upper end of the first section  25 , for mounting the air moving device  12  to a support. The first section  25 , when viewed from the side, has a curved, slightly radially outwardly convex shape that conforms to the curvature of the cowling  19 . The shelf  26  extends radially inwardly to join with the upstream end of a second section  27 . The second section  27  tapers inwardly and extends axially from the shelf  26  to the second end  18  along a smooth curve that goes from radially outwardly convex near the shelf  26  to radially outwardly concave near the second end  18 . The second end  18  forms an air outlet  28  that has a smaller diameter than the air inlet  21 . A plurality of circumferentially spaced external fins  29  extend from the shelf  26  to the second section  27  to provide the appearance of a smooth curve from the air inlet  21  to the air outlet  28  when the housing  13  is viewed from the side.  
         [0037]     The fan  14  includes an impeller  31  having a cylindrical, inner impeller hub  32 , with an electric motor  34  therein, and a plurality of rigidly mounted, circumferentially spaced blades  33  extending radially from the impeller hub  32 . In the illustrated embodiment the impeller  31  has three equally spaced blades  33  and rotates about an axis in a counter-clockwise direction when viewed from above. Each blade  33 , in side view, extends from an upstream edge  35 , downwardly and leftwardly to a downstream edge  36  with each blade  33  being slightly concave, in an airfoil or wing shape, downwardly to propel air rightwardly as shown by the arrow. Each blade  33  then inclines at a selected angle to the axis of rotation of the impeller. Each blade  33  shown extends axially and radially toward the outlet or second end  18  to direct air axially with a rotary component. If the motor  34  runs in the opposite direction, the incline of the blades  33  would be reversed. The fan  14  includes a stationary cylindrical mounting ring  38  that extends around the blades  33 , with the impeller hub  32  being rotably mounted relative to the mounting ring  38 . The mounting ring  38  has spaced, protruding upstream and downstream rims  40  and  41 . The fan  14  mounts in the housing  13  between the cowling  19  and the shelf  26 .  
         [0038]     Each of the vanes  15  is identical and includes upstream portion  43  and a downstream portion  44 . The upstream portion  43  is carried in a stator  46 . The stator  46  has a cylindrical stator hub  47  with a diameter substantially equal to the diameter of the impeller hub  32 . The upstream portions  43  of the vanes  15  are mounted in a circumferentially spaced arrangement around the stator hub  47 , and extend longitudinally along and radially from the stator hub  47 . Each upstream portion  43  has an upstream end  48  and a downstream end  49 . A support body  50  includes a cylindrical stator ring  52  that extends around the upstream portions  43  and connects to the outer ends of the upstream portions  43  of the vanes  15  near the upstream ends  48 . The support body  50  also includes a protruding stator rim  53  that is substantially planar with the upstream ends  48  of the upstream portions  43  of the vanes  15 , and that connects to the stator ring  52  and extends radially outwardly therefrom.  
         [0039]     The housing  13  has an inner surface and the inner housing hub  16  has an outer surface concentric with a spaced from the housing inner surface to define an air flow passage through the housing. The inner housing hub  16  includes the fan hub  32 , stator hub portion  47  and downstream hub portion  57 , each having an outer surface and arranged end to end along the center of the housing and opposite and spaced from the housing inner surface to define the air flow passage. In particular, these outer surfaces shown are cylindrical and substantially the same diameter for a substantial portion of the passage and as the housing  13  converges the downstream hub portion  57  converges to generally follow the curvature of the inside surface of the housing.  
         [0040]     The stator  46  nests in and is separable from the housing  13  with the stator rim  53  between the shelf  26  of the housing  13  and the downstream rim  41  of the mounting ring  38  of the fan  14 , and with a gap  55  having a selected size between the downstream edge  36  of the blades  33  of the impeller  31  and the upstream ends  49  of the upstream portions  43  of the vanes  15 . If the gap  55  is too large, turbulence will be generated in the air flow between the impeller  31  and the vanes  15 , reducing the velocity of the air flow. If the gap  55  is too small, fluid shear stress will generate noise. The size of the gap  55  is generally selected as no greater than a maximum selected dimension to avoid turbulence and no less than a selected minimum dimension to avoid noise, and more particularly selected as small as possible without generating noise.  
         [0041]     The selected size of the gap  55  is generally proportional to the diameter of the impeller  31  and may further be affected by the speed of the impeller  31 . The following are examples: For an impeller  31  with a diameter of 6.00″, at 1800 rpm, the maximum size of the gap  55  should be 1.25″ and the minimum gap should be 0.2″. For an impeller  31  with a diameter of 8.5″, at 1400 rpm, the maximum size of the gap  55  should be 1.25″, and the minimum gap should be 0.2″ but could be 0.020 for lower rpm&#39;s as the size of the gap is rpm dependent. Generally, the maximum size of the gap  55  should be less than one half the diameter of the impeller  31 .  
         [0042]     In the illustrated embodiment, eight equally spaced upstream portions  43  of the vanes  15  are provided, and when viewed from the side, the upstream portions  43  of the vanes  15  extend straight upwardly from the downstream ends  49  and then curve leftwardly near the upstream ends  48 . The upstream portion  43  of each curved vane portion is inclined at an angle opposite the incline of the blade  33  that extends axially and radially inward toward the outlet or second end  28  to assist in converting the rotary component of the air flow into laminar and axial flow in the housing.  
         [0043]     Straight upstream portions  43 A of the vanes  15  may also be used, as shown in  FIG. 7 , and other numbers of vanes  15  may be used. Further, if the motor  34  runs in the opposite direction, the incline of the curvature near the upstream ends  48  would be reversed.  
         [0044]     The downstream portions  44  of the vanes  15  attach at an inner end to a downstream inner housing hub portion  57 , are circumferentially spaced and extend radially outwardly from the housing hub portion  57  to the housing  13 . The housing hub portion  57  and the downstream portions  44  of the vanes  15  extend axially from the stator  46  to or near the air outlet  28 . The housing hub portion  57  has a circular cross section, has a diameter substantially equal to the diameter of the stator housing hub portion  47  at the upstream end adjacent to the stator housing hub portion  47 , and tapers downstream to a point  58  near the air outlet  28 . This hub portion may be characterized as torpedo shaped. In the illustrated embodiment there are four downstream portions  44  of the vanes  15  circumferentially spaced at 90 degrees, with each downstream portion  44  being aligned with an upstream portion  43  of a vane  15 . Other numbers of downstream portions  44  of the vanes  15  can be used.  
         [0045]     The number of the blades  33  may be 2, 3, 4, 5, 6, 7 or 8. The number of the vanes  15  may be 2, 3, 4, 5, 6, 7 or 8. The number of vanes  15  should be different from the number of blades  33 . If the number of vanes  15  and blades  33  are the same, added noise is generated due to harmonics.  
         [0046]     The air moving device  12  discharges air at a high velocity in a generally axial flow having a columnar pattern with minimal lateral dispersion after exiting the air outlet  28 . The cowling  19  extends along a curve toward the inside to reduce turbulence and noise for air flow entering the air inlet  21 . The impeller hub  32 , the stator hub  47  and the housing hub  57  form the inner housing hub  16 . The taper of the housing hub  57  generally follows the taper of the housing  13  so that the cross sectional area for air flow decreases about 10% to 35% through the air moving device  12  to avoid back pressure and at the same time increase air flow velocity. In the embodiment shown the air flow decreases about 22%.  
         [0047]     The vanes  15  convert the rotary component of the air flow from the impeller  31  into laminar and axial air flow in the housing. The leftward curve of the upstream ends  48  of the upstream portions  43  of the vanes  15 , in the illustrated embodiment, reduces the energy loss in the conversion of the rotary component of the air flow from the impeller  31  into laminar and axial air flow in the housing. The small gap  55  between the impeller  31  and vanes  15  prevents the generation of turbulence in the air flow in the gap  55 . The taper of the housing  13  in combination with the taper of the housing hub  57  to the point  58  allows the air flow to exit the air outlet  28  in a continuous, uninterrupted columnar pattern with minimal dispersion, with no center hole or gap at a linear speed greater than would be imparted by a fan alone. The inside surface of the housing  13  is a substantially smooth uninterrupted surface to minimize turbulence and energy loss.  
         [0048]     The hanger  23  is mounted to rotate and lock relative to the housing  13 , so that when the hanger  23  is attached to an overhead support such as ceiling, the air flow from the air moving device  12  may be directed vertically or aimed at any selected angle from the vertical as shown in  FIG. 8 . As shown in  FIGS. 1 and 9 , the first section  25  of the housing  13  includes mounting tabs  91  on opposite sides on the upper edge of the first section  25 . Each mounting tab  91  includes a round, outwardly directed mounting face  92 , and a housing aperture  93  that extends inwardly through the center of the mounting tab  91 . A pair of outwardly projecting housing ridges  94  extend radially on the mounting face  92  on opposite sides of the housing aperture  93 .  
         [0049]     Each end  24  of the hanger  23  has a round, inwardly facing hanger end face  96 , similar in size to the mounting face  92  on the housing  13 . A hanger end aperture  97  extends through the center of the hanger end face  96 . A plurality of spaced, radially extending grooves  98 , sized to receive the housing ridges  94 , are provided on each hanger end face  96 . Bolt  100  extends through the hanger end aperture  97  and threads into an internally threaded cylindrical insert  101 , rigidly affixed in housing aperture  93 . The angle of the housing  13  is chosen by selecting a pair of opposed grooves  97  on each hanger end  24  to receive the housing ridges  94 . The pivotal arrangement enables the housing to move to a selected angle and is lockable at the selected angle to direct air flow at the selected angle.  
         [0050]      FIG. 10  shows an air moving device  12  mounted to the ceiling  62  of a room  63  shown as being closed sided with opposed side walls. Warm air near the ceiling  62  is pulled into the air moving device  12 . The warm air exits the air moving device  12  in a column  64  that extends to the floor  65 . When the column  64  reaches the floor  65 , the warm air from the ceiling pushes the colder air at the floor  65  outward towards the opposed side walls  66  and upward towards the ceiling  62 . When the column  64  reaches the floor  65 , the warm air from the ceiling will also transfer heat into the floor  65 , so that heat is stored in the floor  65 . The stored heat is released when the ceiling is cooler than the floor. The heat may also be stored in articles on the floor and earth under the floor. The air moving device  12  destratifies the air in a room  63  without requiring the imperforate physical tube of many prior known devices. The air moving device  12  destratifies the air in a room  63  with the warmer air from the ceiling  62  minimally dispersing before reaching the floor  65 , unlike many other prior known devices. The air moving device  12  will also remove dead air anywhere in the room. It is understood that the air moving device  12  may also be mounted horizontally in a container, trailer truck or room as is describe hereafter.  
         [0051]     Referring to  FIG. 11 , an air moving device  12  is fitted with an inlet grill  68  and an electric connector  69  for attachment to a light can  70  with a light bulb socket  71  at the upper end. The inlet grill  68  includes a plurality of circumferentially spaced grill fins  72  that attach to the first end  17  of the housing  13 . The grill fins  72  are separated by air intake slots  73 , and extend axially outwardly from the first end  17  and curve radially inwardly and are integral with a flat circular mounting plate  74  that is substantially parallel with the first end  17 . The electrical connector  69  has a tube  76  that is integral at one end with the center of the mounting plate  74  and extends axially therefrom, and a light bulb type, right hand thread externally threaded male end  77  attached to the other end of the shaft  78 . Grill  68 , plate  74  and tube  76  are shown as made of a one piece construction. Plate  74  has holes that received screws  83  or like fasteners to fasten plate  74  to ceiling  62 .  
         [0052]     The shaft  78  telescopes in the tube  76 . The tube  76  has a pair of opposed keyways  76 A that receive keys  78 A on the shaft  78  which allow axial sliding movement of the shaft  78  in the tube  76 . A compression spring  75  fits in the tube and bears against the bottom of shaft  78  and top of plate  74 . Preferably the shaft  78  has a selected length relative to the length of the can  70  such that when the air moving device  12  is mounted in a can  70  in a ceiling  62 , the threaded male end  77  engages the socket  71  before the mounting plate  74  contacts the ceiling  62  and when the threaded male end  77  is screwed into the socket  71 , the mounting plate  74  bears against the ceiling  62 . The spring  75  is compressed between plate  74  and shaft  78 . Screws  83  fasten the plate to the ceiling  62 . Since the light can  70  may be open to air above the ceiling  62 , the mounting plate  74  is preferably sized to cover the open lower end of the can  70 , so that only air from below the ceiling  62  is drawn into the air moving device  12 . The air moving device  12  fitted with the inlet grill  68  and the electrical connector  69  can also be used with a ceiling light socket.  
         [0053]     The air moving device  12  may include an intake grill  79  for preventing objects from entering the impeller  31 , as shown in  FIG. 12 . The intake grill  79  shown has a substantially hemispherical shape, and includes a plurality of circumferentially spaced grill fins  80  separated by intake slots  81 . The grill fins  80  extend axially outwardly and curve radially inwardly from the first end  17  of the housing  13  to a central point  82  spaced from the first end  17 . Other shapes of intake grills are suitable for the present invention.  
         [0054]      FIG. 13  shows an air moving device  12  with a misting nozzle  84 . The nozzle  84  extends through the point  58  of the housing hub  57  to spray water into the column of air exiting the air outlet  28  to cool the air through evaporation. The media exiting the nozzle  84  and being supplied through tube  85  can have other purposes such as a disinfectant or a fragrance or a blocking agent for distinctive needs. The nozzle  84  connects to a water line  85 , in the housing hub  59  that connects to a water source (not shown).  
         [0055]      FIG. 14  shows an air moving system  86  for use in buildings with very high ceilings, including an air moving device  12 , an upwardly extending, tube  87  (shown cut away) connected at a lower end to the air inlet  21  of the air moving device  12 , and a truncated upper air moving device  88  having an air outlet  89  connected to the upper end of the tube  87 . The housing of device  88  is called truncated because it may be shortened or cut off below the fins  29 . A conventional air moving device  12  may be used for device  88 . The tube  87  may be flexible and is preferably fire resistant. The air moving system  86  is mounted to a ceiling or like support with the air outlet  28  of the air moving device  12  spaced above the floor, preferably about 10 to 50 feet. The tube may be for example from 30 to 100 feet long. The upper air moving device  88  at the top of the system  86  has a higher air moving flow capacity than the air moving device  12  at the bottom of the cascading system  86 . By way of example, and not as a limitation, the upper air moving device  88  may have a capacity of 800 cfm and the air moving device  12  may have a capacity of 550 cfm.  
         [0056]      FIGS. 15, 15A ,  15 B,  15 C,  15 D and  16  show the air moving device  12  mounted in an opening  103  in a ceiling  104 . A generally cylindrical can  105  mounts on and extends above the ceiling  104 , and has an open can bottom  106 , and a closed can top  107 . The can top  107  includes a semi-circular, downward opening, circumferentially extending channel  108 . A semi-circular fin  111  extends radially across the channel  108  to prevent swirling of the air before entering the air inlet  21 . Additional fins may be used. A grill and support assembly  125  mounts to the ceiling and extends and connects to the exterior of the housing of device  12 . A grill including spaced openings  110  between fins  109  to allow air to flow up from the room along the housing and past the cowling  19  into the inlet  21 . The grill and support assembly  125  includes an outer ring  120  fastened to the underside of the ceiling including the convexly curved grill fins  109  with air openings  110  between connected outer ring  120  and an inner ring  121 . Ring  121  has a spherical concave inner bearing surface  122 . A ring  123  has a spherical convexly curved exterior bearing surface  124  is mounted on and affixed to the housing with bearing surfaces  122  and  124  mating in a frictional fit to support the housing to be at a vertical position or tilted at an angle to the vertical axis and be held by friction at the vertical axis or a selected angle relative to the vertical axis to direct air flow as required.  
         [0057]     The can  105  has an outwardly extending bottom flange  140  that fits against the underside of the ceiling  104 . The can  105  preferably has four circumferentially spaced bottom openings  141  at 90 degree intervals that are rectangular in shape and extend up the can wall a short distance from the bottom flange  140 . A clamping member  142  preferably made as a molded plastic body has a main body portion  143  above the ceiling  104  outside the can wall and an end flange portion  144  that fits inside the can opening  142 . The main body portion  143  has a U-shaped outer wall portion  145  and an inner hub portion  146  having an aperture  147 . The clamping member  142  inserts into the opening  141  via the open end of the can. A bolt fastener  151  extends through a hole in the flange, through a hole in the ceiling and threads into the aperture  147  in the main body portion to clamp the can  105  to the ceiling  104 .  
         [0058]     As shown in  FIG. 15D  the grill and support assembly  125  is mounted to the ceiling  104  and can  105  by a bolt fastener  149  extending through an aperture in ring  120 , through the ceiling  104  and into a nut  150  in flange  140  in the can. Preferably there are four bolt fasteners  149  at 90 degree intervals midway between fasteners  151  above described. The ceiling  104  typically would be a plasterboard ceiling in which a suitable hole is cut. A variation of  FIG. 15  would be to extend or form the peripheral of outer ring  120  into a flat panel having a dimension of 2 ft. by 2 ft. that would fit in and be held by a grid that holds a conventional ceiling panel.  
         [0059]     Referring to  FIG. 17 , an air moving device is fitted with an inlet grill  113 , a light bulb style threaded male end  114  for threading into a light bulb socket, and a light bulb socket  115 . The inlet grill  113  includes a plurality of circumferentially spaced grill fins  116  that attach to the first end of the housing  13 . The grill fins  116  are separated by air intake slots  117 , and extend axially outwardly from the first end  17  and curve radially inwardly to a flat circular mounting plate  118  that is substantially parallel with and spaced axially from the first end  17 . Threaded male end  114  is mounted on and extends upwardly from the mounting plate  118 . The socket  115  is mounted inside the housing  13  in a downwardly opening fashion so that light from a bulb  119  threaded into the socket  115  is directed downwards.  
         [0060]     Referring now to  FIG. 18 , there is shown a tent having an inclined top  132  extending down from an apex and connected at the lower end to a vertical side wall  131  and terminating above a floor  133  to provide a side opening  134  so that the tent is an open sided room. The air moving device  12  is mounted below the top apex and directs the air in the room downwardly in a columnar pattern to the floor and along the floor and then back with some air passing in and out the side openings  134  along the floor  133 . For wide tents, the air will pass up before it reaches the side walls.  
         [0061]     The air moving device and system herein described has relatively low electrical power requirement. A typical fan motor is 35 watts at 1600 rpm for an impeller of 8.5″ that will effectively move the air from the ceiling to the floor in a room having a ceiling height of 30 ft. Another example is 75 watts with an impeller diameter 8.5″ at 2300 rpm in a room having a ceiling height of 70 ft.  
         [0062]     Referring now to  FIG. 19 , there is shown a shipping container  161  having an air moving device  12  disposed horizontally in the lower left end. The device  12  directs the air horizontally along the bottom wall or floor, up the opposite side wall and across the top wall to exit an outlet duct  162  above and spaced from the device  12  of the air moving device. The device  12  will penetrate the air and promote flushing and circulation of the air space. The device  12  may be mounted to direct the air generally horizontally or up or down at an angle to the true horizontal. This arrangement may be provided in other air spaces such as a trailer truck, room or the like.  
         [0063]     It is understood that the stator  46  and housing  13  could be made as a single unit. It is also understood that the housing  13  may be made in two sections as for example a tubular section of a selected length may be added to the end of a truncated devices as shown in  FIG. 14 .  
         [0064]     Although the present invention has been described with a certain degree of particularity, it is understood that the present disclosure has been made by way of example and that changes in details of structure may be made without departing from the spirit thereof.

Technology Classification (CPC): 5