air
well
i recently looked at the stores who carry large compressors like (home depot) $1699 for the "big" 7.5 hp 2 cylinder compressor only like 24 cfm@ 125.didnt put out enough cfm to my liking to run my pressure pot blaster...
i had one built by a local comrpessor company...7.5 hp 4 cyl 240v puts out a over 30 cfm .runs @590 rpm and pumps up 80 gallon tank in a little over 3 minutes...i didnt want to have to upgrade later....i spent a little more than the big husky at the depot but will never over work the compressor .
its all based on what equipment your gonna use ....best thing you can get is the rotory screw...they put out alot of cfm but are costly....
my .02
radrambler
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