Manufacturers of
blowers and
compressors usually state their volumetic capacity as Cubic Feet per minute (CFM) or Actual Cubic Feet per Minute (ACFM). Since the volumetric capacity refers to the volume of
air or other gas at the inlet to the unit, it is also often referred to as Inlet CFM (ICFM). All three terms (CFM, ACFM or ICFM) are used interchangeably to mean basically the same thing.
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