Bests & Worsts Reviews from Amazon

So, I ordered 2 of these to boost the air flow into my daughters bedrooms. Living in a tri-level house in the south, the upstairs bedrooms can be extremely difficult to cool. After installing these into the duct work, their rooms are the coolest in the house! In fact, I have to keep them turned all the way down to keep from freezing them out! I have read several posts that mention the noise level. Here's what I found. My oldest daughter's room has rigid, metal duct work. It has excellent air flow, but the metal transmits sound very efficiently. That being said, the fan is about 8 feet from the floor register and the sound is no louder than a typical fan you would have in the bedroom. She's had up to 3 fans going in there at once to try and cool off her room, so it's a non-issue for her! My youngest has flexible duct where I replaced it several years ago and you can't hear the fan at all. Overall, I am very pleased with these units. They work as advertised, maybe even better! The noise is very tolerable and were very easy to install. My only regret is I didn't order them sooner!