High Pressure Blower Wheel Type Backward-Inclined Wheel Diameter 20 in Airflow @ 1.000 in SP 12 250 cfm Airflow @ 2.000 in SP 15 120 cfm Airflow @ 3.000 in SP 14 750 cfm Airflow @ 4.000 in SP 14 403 cfm Airflow @ 5.000 in SP 14 050 cfm Airflow @ 6.000 in SP 13 725 cfm Airflow @ 7.000 in SP 13 375 cfm Airflow @ 8.000 in SP 13 035 cfm Airflow @ 9.000 in SP 12 600 cfm Airflow @ 11.00 in SP 11 790 cfm