In-Line Duct Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 30 in Airflow @ 0.000 in SP 15 720 cfm Airflow @ 0.125 in SP 15 380 cfm Airflow @ 0.250 in SP 15 041 cfm Airflow @ 0.375 in SP 14 680 cfm Airflow @ 0.500 in SP 14 307 cfm Airflow @ 0.750 in SP 13 604 cfm Airflow @ 1.000 in SP 12 860 cfm Airflow @ 1.250 in SP 11 957 cfm Airflow @ 1.500 in SP 10 839 cfm Maximum Static Pressure 1 1/2 in wc