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 5 148 cfm Airflow @ 0.125 in SP 4 972 cfm Airflow @ 0.250 in SP 4 796 cfm Airflow @ 0.375 in SP 4 598 cfm Airflow @ 0.500 in SP 4 391 cfm Airflow @ 0.750 in SP 3 916 cfm Airflow @ 1.000 in SP 3 203 cfm Maximum Static Pressure 1 in wc Maximum Inlet Air Temperature 160 Degrees F Shaft Diameter 1 in