Knowledgebase: Whole House Fans
Whole House Fan dimensions
Posted by on 24 January 2012 04:21 PM

   FAN         ROUGH            INSIDE SHUTTER   OUTSIDE SHUTTER
  SIZE       OPENING**          DIMENSIONS         DIMENSIONS
   24"     25 1/2 x 27 3/4      23 3/4 x 25 1/2     28 x 29 3/4
   30"     29 1/4 x 32            27 1/4 x 29 3/4     31 1/2 x 34
   36"     37 1/4 x 33 1/2      35 x 31 1/4           39 1/4 x 35 3/4

 

Length of the veins:

26 7/8'' on the 24'' - veins run lengthwise

31'' on the 30'' - veins run lengthwise

32 3/4'' on the 36'' - veins run crosswise

 

Center vein is stationary to allow no-cut joist installation - when stationary vein is positioned over the joist, the louvers are free to open up into the space between the joists.

 Special Note regarding Model CX36BD2SPD: The Joist-In Installation method may
be used ONLY if the joist centers are 24” apart or greater, AND if there is enough space
between the involved joist(s) and any wall(s).

                        Rough Opening          Shutter Inside           Shutter Outside

24” fan            26  X  28                     23 ¾  X  25 ½             27 ¾  X  29 ¾

30” fan            29 ½  X  32 ¼             27 ¼  X  29 ¾             31 ½  X  34

36” fan            37 ½  X  34                 35  X  31 ½                 39 ¼  X  35 ¾

 

Veins run lengthwise on 24” and  30” – crosswise on 36”

Center vein is stationary to allow no-cut joist installation

 

Finished overall dimensions of whole house fan frames only :

24”                  28 3/8  X  28 3/8

30”                  35  X  35

36”                  42 1/8  X  42 1/8

**Frames are installed on top of the joists, and shutters upen up between the joists,

    so rough openings are SMALLER than frame sizes.

SEE ALSO: CORRECT SIZING OF A WHOLE HOUSE FAN

 


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