High Pressure Blower Wheel Type Backward-Inclined Wheel Diameter 18 1/4 in Airflow @ 1.000 in SP 7 265 cfm Airflow @ 2.000 in SP 9 670 cfm Airflow @ 3.000 in SP 9 388 cfm Airflow @ 4.000 in SP 9 120 cfm Airflow @ 5.000 in SP 8 855 cfm Airflow @ 6.000 in SP 8 590 cfm Airflow @ 7.000 in SP 8 306 cfm Airflow @ 8.000 in SP 7 990 cfm Airflow @ 9.000 in SP 7 653 cfm Airflow @ 11.00 in SP 6 900 cfm