In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 13 1/2 in Airflow @ 0.000 in SP 2 820 cfm Airflow @ 0.125 in SP 2 777 cfm Airflow @ 0.250 in SP 2 734 cfm Airflow @ 0.375 in SP 2 692 cfm Airflow @ 0.500 in SP 2 648 cfm Airflow @ 0.750 in SP 2 561 cfm Airflow @ 1.000 in SP 2 473 cfm Airflow @ 1.250 in SP 2 384 cfm Airflow @ 1.500 in SP 2 291 cfm Airflow @ 2.000 in SP 2 089 cfm