OEM Blower Drive Type Direct Drive Includes Drive Package Yes Assembly Assembled Wheel Diameter 4 3/4 in Airflow @ 0.000 in SP 125 cfm Airflow @ 0.100 in SP 128 cfm Airflow @ 0.400 in SP 137 cfm Airflow @ 0.500 in SP 140 cfm Airflow @ 1.000 in SP 128 cfm Airflow @ 2.000 in SP 84 cfm