Centrifugal Downblast Roof Exhaust Fan, Drive Type Direct Drive, Assembly Assembled, Wheel Diameter 18 in, Base Diameter Not Applicable, Base Length 30 in, Base Width 30 in, Base Shape Square, Nameplate Voltage 115/230V AC, Phase 1, Motor Horsepower 3/4 hp, Exhaust Airflow @ 0.000 in SP 4,433 cfm, For High-Static Pressure Applications No, High-Efficiency Motor No, For Air Type Clean Air, Includes Drive Package Yes, Includes Motor Yes, Mounting Location Roof, Maximum Static Pressure 1 1/4 in wc