Centrifugal Upblast Roof Exhaust Fan Application Kitchens Drive Type Belt Drive Wheel Diameter 21 1/4 in Base Diameter Not Applicable Base Length 29 1/8 in Base Width 29 1/8 in Base Shape Square Maximum Static Pressure 1 3/4 in wc Maximum Airflow 6 806 cfm Minimum Airflow 2 144 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 Housing Material Steel Wheel Material Steel