Blower Wheel Type Radial Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 15 5/8 in Airflow @ 1.000 in SP Not Rated Airflow @ 2.500 in SP Not Applicable Airflow @ 4.000 in SP 2 290 cfm Airflow @ 5.000 in SP 2 050 cfm Airflow @ 6.000 in SP 1 810 cfm Airflow @ 7.000 in SP 1 540 cfm Airflow @ 8.000 in SP 1 120 cfm Airflow @ 9.000 in SP Not Applicable Airflow @ 10.00 in SP Not Applicable Airflow @ 11.00 in SP Not Applicable