Blower Wheel Type Radial Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 22 5/8 in Airflow @ 1.000 in SP Not Rated Airflow @ 2.500 in SP Not Applicable Airflow @ 4.000 in SP 5 750 cfm Airflow @ 5.000 in SP 5 270 cfm Airflow @ 6.000 in SP 4 810 cfm Airflow @ 7.000 in SP 4 360 cfm Airflow @ 8.000 in SP 3 855 cfm Airflow @ 9.000 in SP 3 270 cfm Airflow @ 10.00 in SP 2 315 cfm Airflow @ 11.00 in SP Not Applicable