Centrifugal Upblast Roof Exhaust Fan Application Industrial and Commercial Buildings Restaurants Schools Drive Type Belt Drive Wheel Diameter 18 1/2 in Base Diameter Not Applicable Base Length 30 in Base Width 30 in Base Shape Square Maximum Static Pressure 2 in wc Maximum Airflow 5 648 cfm Minimum Airflow 1 763 cfm Maximum Motor Horsepower 1 1/2 hp Minimum Motor Horsepower 1/4 hp Assembly Unassembled Housing Material Aluminum Wheel Material Aluminum