My compressor is putting out 17 CFM @ 90 PSI so I have not run into any air problems. Unless you know for a fact that your air is DRY - DRY - DRY put a coalescing (toilet paper type) filter in line just before you enter the plasma. It will be money well spent as a tiny (itty bitty little thing) water droplet will ruin consumables in a hurry.
I have an Esab 550I and love it!
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