Centrifugal Upblast Roof Exhaust Fan Application Kitchens Drive Type Belt Drive Wheel Diameter 16 1/2 in Base Diameter Not Applicable Base Length 25 1/8 in Base Width 25 1/8 in Base Shape Square Maximum Static Pressure 1 1/2 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 Housing Material Steel Wheel Material Steel