Blower with Motor and Drive Package Wheel Type Forward-Curved Drive Type Belt Drive Includes Drive Package Yes Assembly Unassembled Wheel Diameter 17 3/4 in Airflow @ 0.000 in SP Not Applicable Airflow @ 0.100 in SP Not Applicable Airflow @ 0.125 in SP Not Applicable Airflow @ 0.250 in SP 5 400 cfm Airflow @ 0.375 in SP 4 610 cfm Airflow @ 0.500 in SP 3 180 cfm Airflow @ 0.750 in SP Not Applicable Airflow @ 1.000 in SP Not Applicable Airflow @ 1.250 in SP Not Applicable