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 21 198 cfm Airflow @ 0.125 in SP 20 802 cfm Airflow @ 0.250 in SP 20 407 cfm Airflow @ 0.375 in SP 20 011 cfm Airflow @ 0.500 in SP 19 615 cfm Airflow @ 0.750 in SP 18 505 cfm Airflow @ 1.000 in SP 17 515 cfm Airflow @ 1.250 in SP 16 475 cfm Airflow @ 1.500 in SP 15 153 cfm Maximum Static Pressure 1 1/2 in wc