Centrifugal Downblast Exhaust Ventilator, Standard Duty, Unassembled With Drive Package, Wheel Dia. (In.) 30-1/2, CFM @ 0.000-In. SP 10772, CFM @ 0.500-In. SP 9228, Sones @ 0.250-In. SP @ 5 Ft. 17.7, Max. Inlet Temp. (Deg. F) 180, Motor Voltage 208-220/440, Motor Hz 60, 3 Phase, Motor HP 2, Mounting Location Roof, Base Width (In.) 40, Base Length (In.) 40, Requires Roof Curb For New Installations, Includes NEMA 1 Junction Box