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I have 2 compressors, one direct and one belt. I use the belt most often it has 10cfm the direct is 3.4
When I really need lots of air I connect both of them together to one out put hose. Air cut off wheels run wide open all day without running out of air. Impact wrenches have all the grunt to loosen anything.
CFM rules. (like torque). Pressure is what sells (like Horsepower)
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