Centrifugal Downblast Roof Exhaust Fan, Drive Type Belt Drive, Assembly Unassembled, Mounting Location Roof, Wheel Diameter 18 1/2 in, Base Diameter Not Applicable, Base Length 30 in, Base Width 30 in, Base Shape Square, Minimum Airflow 1,882 cfm, Maximum Airflow 5,677 cfm, Maximum Motor Horsepower 2 hp, Minimum Motor Horsepower 1/4 hp, Minimum Motor Speed 730 RPM, Maximum Motor Speed 1,460 RPM, Maximum Static Pressure 2 in wc, For High-Static Pressure Applications No