Centrifugal Downblast Roof Exhaust Fan, Drive Type Direct Drive, Assembly Assembled, Wheel Diameter 11 in, Base Diameter Not Applicable, Base Length 22 in, Base Width 22 in, Base Shape Square, Nameplate Voltage 115V AC, Phase 1, Motor Horsepower 1/2 hp, Exhaust Airflow @ 0.000 in SP 1,098 cfm, For High-Static Pressure Applications Yes, High-Efficiency Motor Yes, For Air Type Clean Air, Includes Drive Package Yes, Includes Motor Yes, Mounting Location Roof, Maximum Static Pressure 2 1/4 in wc