In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 18 in Airflow @ 0.125 in SP 4 176 cfm Airflow @ 0.250 in SP 4 127 cfm Airflow @ 0.375 in SP 4 061 cfm Airflow @ 0.500 in SP 3 994 cfm Airflow @ 0.750 in SP 3 848 cfm Airflow @ 1.000 in SP 3 685 cfm Airflow @ 1.250 in SP 3 499 cfm Airflow @ 1.500 in SP 3 296 cfm Airflow @ 2.000 in SP 2 744 cfm For High-Static Pressure Applications Yes