http://www.specialprojects.com/equipment/6489/
Industrial Air Inc. centrifugal fan. Size 231 HD. Blower has up to an estimated 10176 cfm @ 10" static pressure with a 50 hp 1770 rpm motor based on a similar newer model. Blower has a 17" diameter inlet with a 14" diameter reducer and a 14" x 17" outlet. The blower has a 29" diameter x 11" wide fan blade. Requires motor.