In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 36 in Airflow @ 0.000 in SP 23 326 cfm Airflow @ 0.125 in SP 22 967 cfm Airflow @ 0.250 in SP 22 607 cfm Airflow @ 0.375 in SP 22 248 cfm Airflow @ 0.500 in SP 21 888 cfm Airflow @ 0.750 in SP 21 011 cfm Airflow @ 1.000 in SP 19 986 cfm Airflow @ 1.250 in SP 19 146 cfm Airflow @ 1.500 in SP 18 195 cfm Airflow @ 2.000 in SP 15 786 cfm