Gary, You can get fans that move 2250 cfpm that are about 6 or 9 inches, I think. Its at a contractors equipment place. Great fan, completely silent and moves a ton of air. Ask RAllard for exact name of place and more info. I got a couple fans from WalMart recently that are great! Not easy to mount, but, for me they could be clipped and moved around some to get the maximum benefit. They are white, 6 inch fans and silent. I went to a WalMart that had them running on display so I could hear them. Not like the computer fans or radio shack fans that either move little air or make noise. These make a blast of cool air and are completely silent, all plastic.