Centrifugal Upblast Roof Exhaust Fan, Application Industrial and Commercial Buildings, Restaurants, Schools, Drive Type Belt Drive, Wheel Diameter 21 1/4 in, Base Diameter Not Applicable, Base Length 30 in, Base Width 30 in, Base Shape Square, Maximum Static Pressure 2 1/2 in wc, Maximum Airflow 5,943 cfm, Minimum Airflow 2,024 cfm, Maximum Motor Horsepower 3 hp, Minimum Motor Horsepower 1/2 hp, Maximum Motor Speed 1,600 RPM, Minimum Motor Speed 880 RPM, Assembly Unassembled