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 4 860 cfm Airflow @ 0.375 in SP 4 760 cfm Airflow @ 0.500 in SP 4 658 cfm Airflow @ 0.750 in SP 4 460 cfm Airflow @ 1.000 in SP 4 265 cfm Airflow @ 1.250 in SP 4 070 cfm Airflow @ 1.500 in SP 3 875 cfm Airflow @ 2.000 in SP 3 470 cfm Airflow @ 2.500 in SP 2 970 cfm Airflow @ 3.000 in SP Not Applicable