Centrifugal Upblast Roof Exhaust Fan, Application Industrial and Commercial Buildings, Restaurants, Schools, Drive Type Belt Drive, Wheel Diameter 13 1/2 in, Base Diameter Not Applicable, Base Length 22 in, Base Width 22 in, Base Shape Square, Maximum Static Pressure 1 1/2 in wc, Maximum Airflow 2,256 cfm, Minimum Airflow 1,003 cfm, Maximum Motor Horsepower 1/2 hp, Minimum Motor Horsepower 1/4 hp, Maximum Motor Speed 1,435 RPM, Assembly Unassembled, Housing Material Aluminum