Fan
I used this as a replacement in my Innovation, the original fan was broken, and I don't notice a difference of air. I think the difference is for 12 amp motors. The fan had to be more durable, hence the metal nut and thicker plastic. The old style fan had plastic threads. I notice too that the blades are lower to give the fan chamber more clearance. I assume this is to help larger particles get through the chamber to avoid breakage of the chamber.