Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 24 1/2 in Airflow @ 0.250 in SP 9 179 cfm Airflow @ 0.500 in SP 8 871 cfm Airflow @ 0.750 in SP 8 539 cfm Airflow @ 1.000 in SP 8 175 cfm Airflow @ 1.250 in SP Not Applicable Airflow @ 1.500 in SP 7 304 cfm Airflow @ 2.000 in SP 5 990 cfm Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable Airflow @ 3.500 in SP Not Applicable