OEM Blower, Wheel Type Forward-Curved, Drive Type Direct Drive, Includes Drive Package Not Applicable, Assembly Assembled, Wheel Diameter 4 1/8 in, Airflow @ 0.000 in SP 148 cfm, Airflow @ 0.100 in SP 144 cfm, Airflow @ 0.125 in SP Not Applicable, Airflow @ 0.250 in SP 136 cfm, Airflow @ 0.375 in SP Not Applicable, Airflow @ 0.400 in SP 130 cfm, Airflow @ 0.500 in SP 124 cfm, Airflow @ 0.750 in SP Not Applicable, Airflow @ 1.000 in SP 86 cfm, Airflow @ 1.250 in SP Not Applicable WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)