High Pressure Blower Wheel Type Backward-Inclined Wheel Diameter 18 1/4 in Airflow @ 1.000 in SP 11 710 cfm Airflow @ 2.000 in SP 11 377 cfm Airflow @ 3.000 in SP 11 040 cfm Airflow @ 4.000 in SP 10 725 cfm Airflow @ 5.000 in SP 10 410 cfm Airflow @ 6.000 in SP 10 105 cfm Airflow @ 7.000 in SP 9 780 cfm Airflow @ 8.000 in SP 9 420 cfm Airflow @ 9.000 in SP 9 000 cfm Airflow @ 11.00 in SP 8 125 cfm