How do I select the correct UnderAire Crawl Space Ventilator model for my crawl space?

Calculate the cubic area of the crawl space by multiplying the length width height. Divide this number by 15 to determine the minimum CFM necessary to fully ventilate the space in 15 minutes. Example: 20 wide 40 long 3 high crawl space = 2400 cubic ft. 2400 cubic ft. 15 = 160 CFM of ventilation.

Choose two V1 or V1D ventilators or one V2D ventilator. More.

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