Centrifugal Upblast Roof Exhaust Fan, Application Industrial and Commercial Buildings, Drive Type Belt Drive, Wheel Diameter 11 1/4 in, Base Diameter Not Applicable, Base Length 22 in, Base Width 22 in, Base Shape Square, Maximum Static Pressure 1 1/4 in wc, Maximum Airflow 1,549 cfm, Minimum Airflow 861 cfm, Maximum Motor Horsepower 1/3 hp, Minimum Motor Horsepower 1/4 hp, Maximum Motor Speed 1,820 RPM, Minimum Motor Speed 1,660 RPM, Assembly Unassembled, Housing Material Aluminum