> That's not quite right. The die grinder needs its air supply > at 90 PSI, but in a minute it will exhaust 4 CFM of free air, > not 4 CFM of 90 PSI air or 28 CFM of free air. http://www.b2bchinasources.com/showroom.php?c=6707&f=5&p=0000052126 Note where it says "4.5 cfm (32 scfm)". Randall