In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 24 in Airflow @ 0.000 in SP 12 144 cfm Airflow @ 0.125 in SP 11 973 cfm Airflow @ 0.250 in SP 11 802 cfm Airflow @ 0.375 in SP 11 631 cfm Airflow @ 0.500 in SP 11 460 cfm Airflow @ 0.750 in SP 11 070 cfm Airflow @ 1.000 in SP 10 671 cfm Airflow @ 1.250 in SP 10 245 cfm Airflow @ 1.500 in SP 9 804 cfm Airflow @ 2.000 in SP 8 797 cfm