Centrifugal Roof Supply Fan Mounting Location Roof and Wall Wheel Diameter 11 1/8 in Base Diameter Not Applicable Base Length 30 in Base Shape Square Base Width 30 in Maximum Airflow 3 092 cfm Minimum Airflow 735 cfm Maximum Motor Horsepower 1 hp Minimum Motor Horsepower 1/6 hp Minimum Motor Speed 415 RPM Maximum Motor Speed 1 090 RPM Maximum Static Pressure 1 in wc Number of Filters 1 Filter Housing Depth 22 in Filter Housing Height 21 1/4 in Filter Housing Width 21 1/8 in