There is one in the restroom, and another one in the adjacent toilet. They were openly advertised to me as being virtually entirely silent fans, which is the primary reason why I decided to purchase them. It turned out that the noise level of this gadget is roughly the same as that of cheaper alternatives (maybe a bit quieter, but to say for sure, we need accurate measurements of the noise level), and as a result, I believe that the price is far higher than it should be. However, only time will tell how dependable they are and how simple it is to keep them free of dirt and debris. assuming something comes to light while I'm using it, I'll update the review as soon as I can, assuming that's even possible.