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 5 175 cfm Airflow @ 0.375 in SP 5 010 cfm Airflow @ 0.500 in SP 4 855 cfm Airflow @ 0.750 in SP 4 560 cfm Airflow @ 1.000 in SP 4 255 cfm Airflow @ 1.250 in SP 3 925 cfm Airflow @ 1.500 in SP 3 525 cfm Airflow @ 2.000 in SP Not Applicable Airflow @ 2.500 in SP Not Applicable Airflow @ 3.000 in SP Not Applicable