Blower Wheel Type Backward-Inclined Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 27 in Airflow @ 0.250 in SP 8 070 cfm Airflow @ 0.500 in SP 7 681 cfm Airflow @ 0.750 in SP 7 283 cfm Airflow @ 1.000 in SP 6 864 cfm Airflow @ 1.250 in SP Not Applicable Airflow @ 1.500 in SP 5 893 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