Downblast Exhauster Drive Type Belt Drive Assembly Unassembled Mounting Location Roof and Wall Wheel Diameter 18 1/4 in Base Diameter Not Applicable Base Length 28 in Base Width 28 in Base Shape Square Minimum Airflow 1 000 cfm Maximum Airflow 4 900 cfm Maximum Motor Horsepower 2 hp Minimum Motor Horsepower 1/4 hp Minimum Motor Speed 1 500 RPM Maximum Motor Speed 1 500 RPM Maximum Static Pressure 2 1/4 in wc For High-Static Pressure Applications Yes Standards cETLus