Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 22 in Airflow @ 0.000 in SP 4 918 cfm Airflow @ 0.250 in SP 4 611 cfm Airflow @ 0.500 in SP 4 268 cfm Airflow @ 0.750 in SP 3 851 cfm Airflow @ 1.000 in SP 3 335 cfm Airflow @ 1.250 in SP 2 628 cfm Maximum Static Pressure 1 1/4 in wc Maximum Inlet Air Temperature 104 Degrees F Shaft Diameter 1 1/8 in Bearing Type Ball