Tubeaxial Fan, Drive Type Direct Drive, Includes Drive Package Yes, Includes Motor Yes, Blade Diameter 24 in, Nameplate Voltage 200-230/460V AC, Phase 3, Motor Horsepower 1 hp, Airflow @ 0.000 in SP 8,555 cfm, Maximum Noise Level @ 5 Feet 20 sones, Assembly Assembled, For Air Type Clean Air, Blade Material Aluminum, Housing Material Steel, Number of Blades 6, Number of Speeds 1, Motor Enclosure Totally Enclosed Air Over, Standards AMCA Sound and Air, UL Listed, Bolt Circle Diameter 25 7/8 in