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 1 3/4 in wc, Maximum Airflow 6,806 cfm, Minimum Airflow 3,403 cfm, Maximum Motor Horsepower 2 hp, Minimum Motor Horsepower 1/4 hp, Maximum Motor Speed 1,210 RPM, Minimum Motor Speed 605 RPM, Assembly Unassembled