A lot of people mistake whole house fans as attic fans. And that is justified because in some cases a whole house fan is actually an attic fan with some extension. For example, check this QuietCool...
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Attic fan size calculation Attic fan size (CFM) = 0.7 x Sq.ft area of the attic (Formula 1) The size of an attic fan is calculated in terms of CFM. CFM (Cubic Feet per Minute) is a measure of the...