20 CFM Air Compressors
Chicago Pneumatic QRS Rotary Screw Air Compressor
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Quincy QGS Rotary Screw Air Compressor
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Champion 7.5 HP RV Series Splash Lubricated Electric Stationary Reciprocating Air Compressor
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Champion ADVANTAGE Series Two Stage Simplex Piston Air Compressor
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Champion R-Series Horizontal Simplex Piston Air Compressor -
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Chicago Pneumatic RCP-C Iron Series Two-Stage Air Compressor
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ABAC ABC7-2180VFF 7.5 HP Two-Stage Ironman Air Compressor - 80 Gallon Vertical Full Feature, 175 PSI, 21 CFM C1 Cast Iron Pump
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ABAC ABC7-2180V 7.5 HP Two-Stage Ironman Air Compressor - 80 Gallon Vertical, 175 PSI, 21 CFM C1 Cast Iron Pump
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ABAC AB13-30GH 13 HP Honda Gas Drive Air Compressor - 30 Gallon Horizontal, 175 PSI, 22 CFM
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ABAC AB7-2180VQP 7.5 HP Quiet Power Two-Stage Air Compressor - 80 Gallon Vertical, 175 PSI, 22.3 CFM, 69 dBA
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ABAC AB7-2180HFF 7.5 HP Two-Stage Air Compressor - 80 Gallon Horizontal Premium, 175 PSI, 22.2 CFM T39 Pump
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ABAC AB7-2180VFF 7.5 HP Two-Stage Air Compressor - 80 Gallon Vertical Premium, 175 PSI, 22.2 CFM T39 Pump
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ABAC AB7-2180HS 7.5 HP Two-Stage Air Compressor - 80 Gallon Horizontal, 175 PSI, 22.2 CFM T39 Pump
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ABAC AB7-2180V 7.5 HP Two-Stage Air Compressor - 80 Gallon Vertical, 175 PSI, 22.2 CFM T39 Pump
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Champion Airstation R-Series Horizontal Simplex Piston Air Compressor
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Champion Base-Mounted R-Series Piston Air Compressor
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Champion R-Series Vertical Simplex Piston Air Compressor
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Chicago Pneumatic RCP Quiet-Enclosed Two-Stage Air Compressor
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Atlas Copco CR Cast-Iron Piston Industrial Series Air Compressor
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Atlas Copco CR Cast-Iron Piston Professional Series Air Compressor
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6.5 HP, 60.0 Gal, 3-Phase, 220V, Ultra Quiet Oil-Free Air Compressor - California Air | CAT-60065C
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Chicago Pneumatic SPR 2-8 SpiralAIR Oil-Free Scroll Air Compressor
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Atlas Copco SF+2-6 Oil Free Mono Scroll Compressor
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This page groups compressors rated roughly 18 to 22 CFM. That output covers a three or four bay service shop, a body shop with one paint booth, a cabinet shop, or a small manufacturing cell where several tools run at once. Most machines are 5 HP high output or 7.5 HP two stage piston units on 80 gallon tanks, with a few oil free scroll compressors for clean air applications.
Who buys 20 CFM
Shops that outgrew a standard 5 HP compressor but do not want the cost of a rotary screw. A 7.5 HP two stage piston compressor from ABAC, Champion, Quincy or Chicago Pneumatic gives 20 to 24 CFM at 175 PSI, cycles less than a 5 HP unit under the same load, and is still simple to service. The higher pressure rating means more stored air per gallon of tank than a 135 PSI single stage.
Power and installation
Plan on 230 volt single phase at about 40 amps, or three phase where available. Bolt the unit to the floor on isolation pads, leave 18 inches of clearance around the pump for cooling air, and run the discharge through an aftercooler or a drop leg with a drain before it reaches the dryer.
Dryer sizing
Pair a 20 CFM compressor with a 25 to 30 CFM refrigerated air dryer. If the compressor sits in a hot mechanical room, go a size larger; dryer capacity drops fast as inlet temperature rises above 100 degrees F.
