OEM Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Not Applicable Assembly Assembled Wheel Diameter 3 3/4 in Airflow @ 0.000 in SP 139 cfm Airflow @ 0.100 in SP 127 cfm Airflow @ 0.125 in SP Not Applicable Airflow @ 0.250 in SP 126 cfm Airflow @ 0.375 in SP Not Applicable Airflow @ 0.400 in SP 112 cfm Airflow @ 0.500 in SP 105 cfm Airflow @ 0.750 in SP Not Applicable Airflow @ 1.000 in SP Not Applicable Airflow @ 1.250 in SP Not Applicable