Air compressors

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    I’m confused by the ratings on air compressors. What is the relation between psi, cfm and horsepower? I was looking at the devilbliss spraygun set, and it requires 13cfm at 30psi. Would a compressor with 5cfm at 90psi be able to adequately handle the spray gun? Does the cfm change when the psi changes? In other words, if a compressor is rated at 5cfm @90psi, would that be the equivalent of a 15cfm @30psi? Thanks in advance for your answers!

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