OEM Blower Drive Type Direct Drive Includes Drive Package Yes Assembly Assembled Wheel Diameter 3 3/4 in Airflow @ 0.000 in SP 86 cfm Airflow @ 0.100 in SP 82 cfm Airflow @ 0.400 in SP 69 cfm Airflow @ 0.500 in SP 63 cfm Airflow @ 1.000 in SP 31 cfm Airflow @ 2.000 in SP 0 cfm