Blower with Drive Package Wheel Type Forward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 16 1/2 in Airflow @ 0.250 in SP 6 195 cfm Airflow @ 0.375 in SP 6 045 cfm Airflow @ 0.500 in SP 5 905 cfm Airflow @ 0.750 in SP 5 645 cfm Airflow @ 1.000 in SP 5 390 cfm Airflow @ 1.250 in SP 5 140 cfm Airflow @ 1.500 in SP 4 875 cfm Airflow @ 2.000 in SP 4 250 cfm Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable