Centrifugal Downblast Roof Exhaust Fan Drive Type Belt Drive Assembly Unassembled Wheel Diameter 18 1/2 in Base Diameter Not Applicable Base Length 30 in Base Width 30 in Base Shape Square Nameplate Voltage 115/208-230V AC Phase 1 Motor Horsepower 1/2 hp Exhaust Airflow @ 0.000 in SP 3 655 cfm For High-Static Pressure Applications No High-Efficiency Motor No For Air Type Flammable Vapor Includes Drive Package Yes Includes Motor Yes Mounting Location Roof