Tubeaxial Fan, Blade Diameter 18 1/2 in, Maximum Motor Horsepower 1 1/2 hp, Minimum Motor Horsepower 1/4 hp, Maximum Motor Speed 2,686 RPM, Minimum Motor Speed 1,215 RPM, Maximum Airflow 40,000 cfm, Minimum Airflow 2,231 cfm, Maximum Static Pressure 2 in wc, For Air Type Clean Air, Assembly Assembled, Blade Material Aluminum, Housing Material Steel, Number of Blades 5, Standards ANSI/AMCA 205-05, ISO 14 694, Bolt Circle Diameter 19 3/4 in, Includes Drive Package No, Includes Motor No