Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 15 in Airflow @ 0.000 in SP 2 944 cfm Airflow @ 0.250 in SP 2 832 cfm Airflow @ 0.500 in SP 2 721 cfm Airflow @ 0.750 in SP 2 598 cfm Airflow @ 1.000 in SP 2 460 cfm Airflow @ 1.250 in SP 2 299 cfm Airflow @ 1.500 in SP 2 120 cfm Airflow @ 1.75 in SP 1 918 cfm Airflow @ 2.000 in SP 1 662 cfm Maximum Static Pressure 2 in wc