Tubeaxial Fan Drive Type Belt Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 24 in Nameplate Voltage 208-230/460V AC Phase 3 Motor Horsepower 1/2 hp Airflow @ 0.000 in SP 5 730 cfm Maximum Noise Level @ 5 Feet 23 sones Assembly Unassembled For Air Type Emergency Smoke Blade Material Steel 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