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The old standard was 100 linear feet per minute (lfm), and this is still stated in the International Fire Code (IFC). This air velocity is calculated with the spray paint booth empty and using a cross-sectional area of the air flow direction. The more current codes require a minimum of 4 air exchanges per minute for wet or solvent-based paints. Powdercoat booths are required to have 60 lfm.
In the USA flow is normally measured in cubic feet per minute (CFM). You may also see the flow rating in m3/min, l/s, or m3/hr. Basically it's just the volume of air the compressor is supplying and how fast.A cubic foot is 7.48 gallons, so 1 CFM gives you 7.48 gallons of air every minute.Pressure is normally measured in pounds per square inch (psi), but you may also see it as bar, mbar, kg/cm3, or MPa.n that case you must figure out how many cycles you can do in one minute. If you could put in a nail every 2 seconds, and the nailer is .3 cubic feet per cycle at 40 psi, then you'd be using 9 CFM at 40 psi.