Plenum Fan Wheel Type Backward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 30 1/2 in Airflow @ 0.000 in SP 13 239 cfm Airflow @ 0.250 in SP 12 851 cfm Airflow @ 0.500 in SP 12 460 cfm Airflow @ 0.750 in SP 12 046 cfm Airflow @ 1.000 in SP 11 621 cfm Airflow @ 1.250 in SP 11 139 cfm Airflow @ 1.500 in SP 10 591 cfm Airflow @ 1.75 in SP 9 947 cfm Airflow @ 2.000 in SP 9 259 cfm Maximum Static Pressure 2 in wc