Blower Wheel Type Radial Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 26 1/8 in Airflow @ 2.500 in SP Not Applicable Airflow @ 4.000 in SP 6 925 cfm Airflow @ 5.000 in SP 6 260 cfm Airflow @ 6.000 in SP 5 635 cfm Airflow @ 7.000 in SP 4 955 cfm Airflow @ 8.000 in SP 4 135 cfm Airflow @ 9.000 in SP Not Applicable Airflow @ 10.00 in SP Not Applicable Airflow @ 11.00 in SP Not Applicable