Tubeaxial Fan Drive Type Belt Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 24 in Nameplate Voltage 115/230V AC Phase 1 Motor Horsepower 3 hp Airflow @ 0.000 in SP 10 310 cfm Maximum Noise Level @ 5 Feet 50 sones Assembly Unassembled For Air Type Clean Air Blade Material Aluminum Housing Material Steel Number of Blades 6 Number of Speeds 1 Motor Enclosure Totally Enclosed Fan Cooled Standards AMCA Bolt Circle Diameter 25 3/4 in