Tubeaxial Fan Drive Type Direct Drive Includes Drive Package Yes Includes Motor Yes Blade Diameter 21 in Nameplate Voltage 230V AC Phase 1 Motor Horsepower 1 hp Airflow @ 0.000 in SP 6 193 cfm Maximum Noise Level @ 5 Feet 26 sones Assembly Assembled For Air Type Clean Air Blade Material Aluminum Housing Material Steel Number of Blades 6 Number of Speeds 2 Motor Enclosure Totally Enclosed Air Over Standards AMCA Sound and Air UL Listed Bolt Circle Diameter 22 5/8 in