Centrifugal Upblast Exhaust Ventilator, Standard Duty, Unassembled With Drive Package, Wheel Dia. (In.) 12-1/2, CFM @ 0.000-In. SP 2037, CFM @ 0.500-In. SP 1816, Sones @ 0.250-In. SP @ 5 Ft. 16.7, Max. Inlet Temp. (Deg. F) 300, Motor Voltage 115/230, Motor Hz 60, 1 Phase, Motor HP 1/2, Mounting Location Roof, Base Width (In.) 19, Base Length (In.) 19, Requires Roof Curb for New Installation, Includes NEMA 1 Junction Box