The rate at which a compressor can deliver air volumeismeasured in cubic feet per minute (CFM). Because atmospheric pressure plays a role in how fast air moves into the cylinder, the CFM will varydepending upontheatmospheric pressure. It will also vary with the temperature and humidity. To set an even playing field, manufacturers calculate standard cubic feet per minute (SCFM) as CFM at sea level at 68 degreesfarenheit at 36% relative humidity. If you reduce the pressure the SCFM goes up and if you raise the pressure the SCFM goes down. The CFM and PSI ratings are important because they indicate the tools that a particular compressor can operate.
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