Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 24 1/2 in Airflow @ 0.000 in SP 6 680 cfm Airflow @ 0.250 in SP 6 404 cfm Airflow @ 0.500 in SP 6 127 cfm Airflow @ 0.750 in SP 5 791 cfm Airflow @ 1.000 in SP 5 453 cfm Airflow @ 1.250 in SP 5 030 cfm Airflow @ 1.500 in SP 4 539 cfm Airflow @ 1.75 in SP 3 880 cfm Maximum Static Pressure 1 1/2 in wc Maximum Inlet Air Temperature 104 Degrees F