Centrifugal Upblast Roof Exhaust Fan Application Industrial and Commercial Buildings Drive Type Belt Drive Wheel Diameter 11 1/4 in Base Diameter Not Applicable Base Length 22 in Base Width 22 in Base Shape Square Maximum Static Pressure 1 1/4 in wc Maximum Airflow 1 549 cfm Minimum Airflow 861 cfm Maximum Motor Horsepower 1/3 hp Minimum Motor Horsepower 1/4 hp Maximum Motor Speed 1 820 RPM Minimum Motor Speed 1 660 RPM Assembly Unassembled Housing Material Aluminum