High Pressure Blower Wheel Type Backward-Inclined Wheel Diameter 16 1/2 in Airflow @ 1.000 in SP 4 267 cfm Airflow @ 2.000 in SP 6 147 cfm Airflow @ 3.000 in SP 5 960 cfm Airflow @ 4.000 in SP 5 771 cfm Airflow @ 5.000 in SP 5 577 cfm Airflow @ 6.000 in SP 5 368 cfm Airflow @ 7.000 in SP 5 146 cfm Airflow @ 8.000 in SP 4 869 cfm Airflow @ 9.000 in SP 4 575 cfm Airflow @ 11.00 in SP 3 905 cfm