Chicago Blower 7.5 hp centrifugal blower. Size D4-7.5-213. Blower has a 6" diameter inlet and 2.75" x 2.75" top outlet. The blower fan blade is 15" in diameter. Capable of 630 cfm@ static pressure of 35.2. Motor and fan blade have a 1:1 ratio and turn at 3500 rpm. Serial number 176177. Requires 230/460 vac 3 phase electrical supply.