OEM Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Not Applicable Assembly Assembled Wheel Diameter 3 7/8 in Airflow @ 0.000 in SP 72 cfm Airflow @ 0.100 in SP 71 cfm Airflow @ 0.125 in SP Not Applicable Airflow @ 0.250 in SP 68 cfm Airflow @ 0.375 in SP Not Applicable Airflow @ 0.400 in SP 61 cfm Airflow @ 0.500 in SP 56 cfm Airflow @ 0.750 in SP Not Applicable Airflow @ 1.000 in SP Not Applicable Airflow @ 1.250 in SP Not Applicable