Solar Attic Fan Sizing Calculator


Use this estimator to help figure out how many attic fans you will need.

To start, enter the length, width, and height of your attic. Alternatively, for more precise calculations you can provide your actual floor area. If you do this you don´t need to enter a length or width. Similarly, rather then entering a height, you can provide your roof pitch in the format x/12. (Meaning the roof rises x inches for every 12 inches it runs, 4/12 is a very common pitch)

Then, choose which of our fans you are interested in purchasing.

The estimator will calculate your attic volume and the number of fans you should use. (Both the minimum and the recommended quantities)

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