In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 20 in Airflow @ 0.000 in SP 5 895 cfm Airflow @ 0.125 in SP 5 741 cfm Airflow @ 0.250 in SP 5 587 cfm Airflow @ 0.375 in SP 5 430 cfm Airflow @ 0.500 in SP 5 253 cfm Airflow @ 0.750 in SP 4 874 cfm Airflow @ 1.000 in SP 4 452 cfm Airflow @ 1.250 in SP 3 878 cfm Maximum Inlet Air Temperature 160 Degrees F Shaft Diameter 1 in