I have a Curtiss 7.5 HP with baldor motor rated at 23CFM at 175 PSI never runs out of air. We run a farm shop and use a lot of BIG airtools. We use a 1" Chicago Pnuematic air gun on semi tires and use DA's quite a bit never have to wait for it or run out of air. Bought it through our local electric motor repair shop. They also handle IR but recommend the Curtiss for more continuous duty and it was cheaper than the IR of the same size. Check it out!