What size attic fan do you need?
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 amount of air the fan moves in a minute. The formula above gives an approximate … Read moreWhat size attic fan do you need?