Product review (2 stars): Not working properly 2 days after installation, but installation is too expensive to justify returning it :(
This hood would be great if was working properly, but only a day or two after installation, it started to make a loud sound when the fan is turned off... as if the fan mechanism is hitting something it shouldn't be as it slows down.  It doesn't make this sound while the fan is running- only while it is slowing to a stop.  It was not cheap to have it installed, otherwise I'd be sending it back.

Not sure if this problem is the fan's fault or the seller not thoroughly checking out the refurbished products.