Blower Wheel Type Radial Drive Type Direct Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 10 7/8 in Airflow @ 0.000 in SP 1 593 cfm Airflow @ 0.250 in SP 1 457 cfm Airflow @ 0.500 in SP 1 309 cfm Airflow @ 0.750 in SP 1 134 cfm Airflow @ 1.000 in SP 916 cfm Airflow @ 1.500 in SP 97 cfm Airflow @ 2.000 in SP Not Applicable Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable Airflow @ 3.500 in SP Not Applicable