How do you calculate GRS/HR?

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V C x ∆G x F1 x F2 x F3 x F4 = Grs/hr. (To determine grains/minute divide answer by 60). = Amount of vapor able to permeate the closed space through construction and vapor barriers. V = volume of controlled space in question – ft.3 C=14 = constant used to translate ft.3 to pounds. This constant is used regardless of the density of the air.

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