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 7 945 cfm Airflow @ 0.500 in SP 7 581 cfm Airflow @ 0.750 in SP 7 174 cfm Airflow @ 1.000 in SP 6 705 cfm Airflow @ 1.250 in SP Not Applicable Airflow @ 1.500 in SP 5 356 cfm Airflow @ 2.000 in SP Not Applicable Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable Airflow @ 3.500 in SP Not Applicable