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airscape

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  1. airscape
    Use this formula, which is based on HVI-916 formula for NFVA CFM=NFVA (square feet) x 2432 x square root(P) where CFM= cubic feet per minute NFVA= net free ventilation area (sq. feet) P = pressure in inches of water column subsituting in P=.05, which is a safe value for maximum attic pressure: CFM=NFVA (square feet) x 2432 x square root(.05) More details here: http://blog.airscapefans.com/archives/homepower-article
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