Tubeaxial Fan Drive Type Belt Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 12 in Nameplate Voltage 208-230/460V AC Phase 3 Motor Horsepower 3/4 hp Airflow @ 0.000 in SP 2 432 cfm Maximum Noise Level @ 5 Feet 59 sones Assembly Unassembled For Air Type Clean Air Blade Material Aluminum Housing Material Steel Number of Blades 4 Number of Speeds 1 Motor Enclosure Totally Enclosed Fan Cooled Standards AMCA Bolt Circle Diameter 13 1/2 in