In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 11 in Airflow @ 0.000 in SP 1 090 cfm Airflow @ 0.125 in SP 1 065 cfm Airflow @ 0.250 in SP 1 041 cfm Airflow @ 0.375 in SP 1 018 cfm Airflow @ 0.500 in SP 995 cfm Airflow @ 0.750 in SP 945 cfm Airflow @ 1.000 in SP 894 cfm Airflow @ 1.250 in SP 835 cfm Airflow @ 1.500 in SP 773 cfm Airflow @ 2.000 in SP 635 cfm Airflow @ 2.500 in SP 395 cfm