How many attic fans are needed?
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The Curious Bag
ANSWERS: 1
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<h4 class="dechead">On One Hand: Optimum Air Exchange
The number of fans used depends on the air exchange rate of the fan and the size of the attic. Fans are rated by the cubic feet per minute (CFM) of air they exchange. Each 1000 square of attic space requires 800 CFM to reach the optimum operation of 10 exchanges per hour.
On the Other: Gable-Mounted vs. Roof-Mounted Fans
Using gable-mounted attic fans limits the number of fans that can be used to the gable vents available. Roof-mounted fans can be mounted anywhere on the roof, allowing multiple fans to be spread out for effective coverage.
Bottom Line
After determining the square footage of attic space and the mounting style desired, compare the CFM on different models to determine how many fans will be needed to optimize air exchange.
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