Blower Wheel Type Radial Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 36 1/2 in Airflow @ 2.500 in SP Not Applicable Airflow @ 4.000 in SP 14 113 cfm Airflow @ 5.000 in SP 12 933 cfm Airflow @ 6.000 in SP 11 738 cfm Airflow @ 7.000 in SP 10 391 cfm Airflow @ 8.000 in SP 8 510 cfm Airflow @ 9.000 in SP Not Applicable Airflow @ 10.00 in SP Not Applicable Airflow @ 11.00 in SP Not Applicable