Blower Wheel Type Forward-Curved Drive Type Direct Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 9 in Airflow @ 0.000 in SP 1 005 cfm Airflow @ 0.125 in SP 968 cfm Airflow @ 0.250 in SP 930 cfm Airflow @ 0.375 in SP 890 cfm Airflow @ 0.500 in SP 850 cfm Airflow @ 0.750 in SP 773 cfm Airflow @ 1.000 in SP 680 cfm Airflow @ 1.250 in SP 480 cfm Airflow @ 1.500 in SP Not Applicable Airflow @ 2.000 in SP Not Applicable Airflow @ 2.500 in SP Not Applicable