This model describes the one-directional pressure driven air flow through an opening, using the equation

V̇ = C Δpm,

where is the volume flow rate in m3/s, C is a flow coefficient, Δp is the pressure difference in Pa, and m is the flow exponent.

A similar model is also used in the CONTAM software (Dols and Walton, 2015). Dols and Walton (2002) recommend to use for the flow exponent m=0.6 to m=0.7 if the flow exponent is not reported with the test results.



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