Centrifugal Downblast Exhaust Ventilator, Standard Duty, Unassembled With Drive Package, Wheel Dia. (In.) 16-3/4, CFM @ 0.000-In. SP 3692, CFM @ 0.500-In. SP 3149, Sones @ 0.250-In. SP @ 5 Ft. 17.0, Max. Inlet Temp. (Deg. F) 180, Motor Voltage 115/230, Motor Hz 60, 1 Phase, Motor HP 3/4, Mounting Location Roof, Base Width (In.) 22, Base Length (In.) 22, Requires Roof Curb For New Installations, Includes NEMA 1 Junction Box