Blower Wheel Type Radial Drive Type Direct Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 7 3/4 in Airflow @ 0.000 in SP 533 cfm Airflow @ 0.250 in SP 448 cfm Airflow @ 0.500 in SP 334 cfm Airflow @ 0.750 in SP 93 cfm Airflow @ 1.000 in SP Not Applicable Airflow @ 1.250 in SP Not Applicable Airflow @ 1.500 in SP Not Applicable Airflow @ 2.000 in SP Not Applicable Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable