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Old 03-14-2010, 10:23 AM   #1
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Attic Fans


I want to put an attic fan in my house to draw the cool air in and exhaust the hot air. I have sometimes heard these fans called whole house fans. Is there any sizing information on these fans? How much attic venting do I need for the fan?

Thanks
Dan

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Old 03-15-2010, 06:23 AM   #2
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Attic Fans


Lots of attic venting. Probably will need to add large louvered grilles at both gable ends. About 1 sq ft for every 700 to 1000 CFM the fan moves.

The fan generally needs to move as many CFM as your homes total cubic volume is.


EG: 36X48 sq ft house with 8 foot ceilings has a volume of 13,824 cubic foot. So that is how many CFM the fan would need to move.

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Old 03-16-2010, 06:02 PM   #3
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Attic Fans


Thank you!!!
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