OEM Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Not Applicable Assembly Assembled Wheel Diameter 5 1/8 in Airflow @ 0.000 in SP 273 cfm Airflow @ 0.100 in SP 245 cfm Airflow @ 0.125 in SP Not Applicable Airflow @ 0.250 in SP 224 cfm Airflow @ 0.375 in SP Not Applicable Airflow @ 0.400 in SP 183 cfm Airflow @ 0.500 in SP 135 cfm Airflow @ 0.750 in SP Not Applicable Airflow @ 1.000 in SP Not Applicable Airflow @ 1.250 in SP Not Applicable