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