Blower with Drive Package Wheel Type Forward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 13 1/2 in Airflow @ 0.250 in SP 4 060 cfm Airflow @ 0.375 in SP 3 940 cfm Airflow @ 0.500 in SP 3 825 cfm Airflow @ 0.750 in SP 3 595 cfm Airflow @ 1.000 in SP 3 365 cfm Airflow @ 1.250 in SP 3 135 cfm Airflow @ 1.500 in SP 2 885 cfm Airflow @ 2.000 in SP 2 050 cfm Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable