Cubic feet per minute (CFM) and pounds per square inch (psi) are the key metrics for evaluating an air compressor. Factors governing performance are typically engine or engine horsepower and compression chamber size. A buyer refers to the CFM and PSI ratings because these numbers tell him which and how many pneumatic tools the compressor can power.
CFM: what does cfm mean in air compressors
The CFM rating refers to the volume of air the compressor can supply. By itself, the CFM rating tells an incomplete story about an air compressor; for example, a small muffin fan on a computer can deliver 200 CFM. CFM ratings are psi specific. A compressor can supply a specific CFM at 45 psi and a different CFM at 90 psi.
SCFM: what does scfm mean in a compressor
The CFM specifications of an air compressor must also include atmospheric pressure, ambient air pressure, temperature and humidity, to obtain accurate and comparable numbers. The term standard cubic feet per minute (SCFM) incorporates these variables.
Standard qualifications; what is scfm in a compressor
Air compressor manufacturers calculate SCFM as CFM at sea level, with an air temperature of 68 F and 36 percent relative humidity. Standard SCFM ratings include a specific pressure, for example, 5.5 SCFM at 90 psi.