Centrifugal Downblast Exhaust Ventilator, Standard Duty, Unassembled With Drive Package, Wheel Dia. (In.) 13-3/4, CFM @ 0.000-In. SP 2391, CFM @ 0.500-In. SP 2158, Sones @ 0.250-In. SP @ 5 Ft. 16.3, Max. Inlet Temp. (Deg. F) 180, Motor Voltage 208-220/440, Motor Hz 60, 3 Phase, Motor HP 1/2, Mounting Location Roof, Base Width (In.) 19, Base Length (In.) 19, Requires Roof Curb For New Installations, Includes NEMA 1 Junction Box