Centrifugal Roof Supply Fan Mounting Location Roof and Wall Wheel Diameter 13 1/4 in Base Diameter Not Applicable Base Length 34 1/2 in Base Shape Square Base Width 34 1/2 in Maximum Airflow 4 176 cfm Minimum Airflow 1 760 cfm Maximum Motor Horsepower 1 1/2 hp Minimum Motor Horsepower 1/3 hp Minimum Motor Speed 550 RPM Maximum Motor Speed 890 RPM Maximum Static Pressure 7/8 in wc Number of Filters 2 Filter Housing Depth 29 1/4 in Filter Housing Height 27 1/2 in