Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 12 1/4 in Airflow @ 0.250 in SP 3 012 cfm Airflow @ 0.500 in SP 2 947 cfm Airflow @ 0.750 in SP 2 875 cfm Airflow @ 1.000 in SP 2 803 cfm Airflow @ 1.250 in SP 2 727 cfm Airflow @ 1.500 in SP 2 648 cfm Airflow @ 2.000 in SP 2 476 cfm Airflow @ 2.500 in SP 2 279 cfm Airflow @ 3.000 in SP 2 020 cfm Airflow @ 3.500 in SP Not Applicable