OEM Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Yes Assembly Assembled Wheel Diameter 6 3/8 in Airflow @ 0.000 in SP 376 cfm Airflow @ 0.100 in SP 359 cfm Airflow @ 0.400 in SP 342 cfm Airflow @ 0.500 in SP 336 cfm Airflow @ 1.000 in SP 306 cfm Airflow @ 2.000 in SP 218 cfm