What is a leaf vacuum impeller?

A leaf vacuum impeller is an integral component of a lawn leaf vacuum system designed to remove, and in some cases, simultaneously shred, unwanted leaves from the user's lawn. The impeller is the rotating fan-like part of the machine that sucks in air and impels it out the other side.

An impeller is made up of vanes connected to a central shaft. It looks similar to a fan or propeller, and in some factors, the mechanics of the two are fairly similar. The difference is that an impeller moves air or water but does not move the object to which it is attached, while a propeller, such as the kind found on a boat, does.