Centrifugal Upblast Roof Exhaust Fan Application Industrial and Commercial Buildings Restaurants Schools Drive Type Belt Drive Wheel Diameter 21 1/4 in Base Diameter Not Applicable Base Length 30 in Base Width 30 in Base Shape Square Maximum Static Pressure 1 3/4 in wc Maximum Airflow 4 289 cfm Minimum Airflow 3 403 cfm Maximum Motor Horsepower 2 hp Minimum Motor Horsepower 1/4 hp Maximum Motor Speed 1 210 RPM Minimum Motor Speed 605 RPM Assembly Unassembled