Centrifugal Upblast Roof Exhaust Fan Application Industrial and Commercial Buildings Restaurants Schools Drive Type Belt Drive Wheel Diameter 16 1/2 in Base Diameter Not Applicable Base Length 22 in Base Width 22 in Base Shape Square Maximum Static Pressure 2 1/4 in wc Maximum Airflow 3 996 cfm Minimum Airflow 1 365 cfm Maximum Motor Horsepower 1 hp Minimum Motor Horsepower 1/4 hp Maximum Motor Speed 1 390 RPM Minimum Motor Speed 875 RPM Assembly Unassembled