What’s the difference between “CFM” and “SCFM”?

SCFM = Standard Cubic Feet per Minute. This is 1 cubic foot of free air at standard atmospheric temperature and pressure (the standard conditions are usually 20°C/68°F and 1 BAR/14.7 PSIA).


CFM = Cubic Feet per Minute. Sometimes this is incorrectly used interchangeably with SCFM meaning free air. Unless the temperature and pressure are specified with CFM, the actual volume of gas flow can’t be determined.

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