Blower Wheel Type Radial Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 33 in Airflow @ 2.500 in SP Not Applicable Airflow @ 4.000 in SP 10 272 cfm Airflow @ 5.000 in SP 9 192 cfm Airflow @ 6.000 in SP 8 115 cfm Airflow @ 7.000 in SP 6 992 cfm Airflow @ 8.000 in SP Not Applicable Airflow @ 9.000 in SP Not Applicable Airflow @ 10.00 in SP Not Applicable Airflow @ 11.00 in SP Not Applicable