Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package No Assembly Unassembled Wheel Diameter 13 1/2 in Minimum Airflow 695 cfm Maximum Airflow 2 233 cfm Maximum Static Pressure 1 1/2 in wc Maximum Inlet Air Temperature 150 Degrees F Shaft Diameter 1 in Bearing Type Ball Wheel Material Aluminum Wheel Width 13.5 in Frame Material Galvanized Inlet Diameter 8 1/2 in Rough Opening Height 18 in Rough Opening Width 18 in Maximum Fan Speed 1 940 RPM