Product review (3 stars): Noisy
This hood was easy to install and worked great until we ran our new oven through its first self cleaning cycle. After running the hood on high for a few hours to clear the burned Christmas pie smell from the house it developed an annoying rattle. Now every time we run it on high it makes a ton of noise.

My only theories for why this might happen are a) I didn't tighten something down properly when I installed it, b) we ran it for too long and it overheated, or c) the manufacturer didn't pay enough attention to quality control. I followed all the installation instructions to the letter and, after rereading the manual, have established that there isn't a duty cycle rating for the fan motor. The only conclusion I can make is that Broan didn't tighten everything down properly at the factory.

I don't feel like subjecting myself to "customer service" so I'm going to try to fix it myself. I will update this review if I find a solution.