The ACFM is Actual Cubic Feet per Minute, The SCFM is Stand. Cubic Feet per Minute
ACFM = SCFM [Pstd / (Pact - Psat Φ)](Tact / Tstd)
where
SCFM = Standard Cubic Feet per Minute
ACFM = Actual Cubic Feet per Minute
Φ = Actual relative humidity
Pstd = Standard absolute air pressure (psia)
Tstd = Standard temperature (oR)
Psat = Saturation pressure at the actual temperature (psi)
Tact = Actual ambient air temperature (oR)
Pact = absolute pressure at the actual level (psia)
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