The MTD 684-04057C-0637 3 Blade Impeller 12" delivers strong airflow to efficiently move snow through the blower system. This impeller is designed as a rotating component that works inside the housing to draw in and propel snow out of the discharge chute. It operates by spinning at high speed, using its three blades to generate the force needed for consistent snow discharge. Built for... https://www.wholetoolbox.com/mtd-684-04057c-0637-3-blade-impeller-12