Product review (1 stars): Useless, not required.
Totally useless.  It's implied that this is required with certain products, but I can't see any time this would be needed.  It's a plate with a 10" hole in it, and a very short extension cord.  If that sounds like something you need, buy it.  This did not interface with any of my other Broan equipment, despite Amazon and Broan sites indicating this was required.  Unfortunately I waited too long to return this, so I"m stuck with an expensive paper weight.