Specifications
Whole-House Fans
HOW TO SPECIFY WHOLE-HOUSE FANS
Calculate the interior square footage of living area (do not include garage, attic or basement) and multiply the total square footage by three. This will give you the CFM number required for the whole-house fan.
| Type | Size | CFM: | For Homes Up To: (sq. feet) |
| Direct-Drive | 24" 30" |
4500 5700 |
1500 1900 |
| Belt-Drive | 30" 36" |
5700 6900 |
1900 2300 |
Whole-House Fans: Belt Drive Fans | Direct Drive Fans
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