High Pressure Blower Wheel Type Backward-Inclined Wheel Diameter 18 1/4 in Airflow @ 1.000 in SP 5 545 cfm Airflow @ 2.000 in SP 7 390 cfm Airflow @ 3.000 in SP 7 175 cfm Airflow @ 4.000 in SP 6 972 cfm Airflow @ 5.000 in SP 6 775 cfm Airflow @ 6.000 in SP 6 565 cfm Airflow @ 7.000 in SP 6 372 cfm Airflow @ 8.000 in SP 6 133 cfm Airflow @ 9.000 in SP 5 839 cfm Airflow @ 11.00 in SP 5 266 cfm