I have installed KDK extractor fan (commercial type) and it clears up the humidity, foul smell and circulate the air very quickly. Maybe I am used to the noise, I find that the noise produced doesn't disturb me. At my bathroom, I have windows in addition to extractor fan which sends air to the external area of the house. If I turned on the extractor fan and washed the toilets, it dries up the floor very quickly too. Extractor fan is is a really good to have feature together with a broad enough louver windows in each toilet.