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 7 648 cfm Airflow @ 0.250 in SP 7 406 cfm Airflow @ 0.500 in SP 7 164 cfm Airflow @ 0.750 in SP 6 904 cfm Airflow @ 1.000 in SP 6 609 cfm Airflow @ 1.250 in SP 6 314 cfm Airflow @ 1.500 in SP 5 970 cfm Airflow @ 1.75 in SP 5 586 cfm Airflow @ 2.000 in SP 5 121 cfm Maximum Static Pressure 2 in wc