In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 30 in Airflow @ 0.000 in SP 17 990 cfm Airflow @ 0.125 in SP 17 693 cfm Airflow @ 0.250 in SP 17 396 cfm Airflow @ 0.375 in SP 17 099 cfm Airflow @ 0.500 in SP 16 776 cfm Airflow @ 0.750 in SP 16 124 cfm Airflow @ 1.000 in SP 15 526 cfm Airflow @ 1.250 in SP 14 888 cfm Airflow @ 1.500 in SP 14 171 cfm Airflow @ 2.000 in SP 12 242 cfm