For a very long time, I opted for a fan to be installed in the bathroom, and that was a decision that served me well. I have an odnushka, and whenever I open a window, the fan starts spinning rapidly almost immediately. This suggests that the hood is in good condition, as well as the bearings in the fan. When it is working from the network, the noise is exactly what is required in order for it to be audible while at the same time not being annoying in any way. I advise