High Pressure Blower Wheel Type Backward-Inclined Wheel Diameter 22 1/4 in Airflow @ 1.000 in SP 15 195 cfm Airflow @ 2.000 in SP 17 870 cfm Airflow @ 3.000 in SP 17 520 cfm Airflow @ 4.000 in SP 17 175 cfm Airflow @ 5.000 in SP 16 845 cfm Airflow @ 6.000 in SP 16 530 cfm Airflow @ 7.000 in SP 16 180 cfm Airflow @ 8.000 in SP 15 900 cfm Airflow @ 9.000 in SP 15 585 cfm Airflow @ 11.00 in SP 14 910 cfm