The standard for measuring extractor lovers is usually "at 3 m", so 3 metres with the lover, and most 4'' enthusiasts range from 24dB to 50dB, with 6'' fans usually starting from 35 dB to 60 dB. To give that some context, avenue noise or typical radio is classed 70 dB, conversational speech at 60 dB, a traditional residence or office 40 dB, a ticking enjoy at 20 dB in addition to a whisper at 15 dB.
Cheers ebs
Just wondering how loud an extractor fan that makes a noise of 24dB - 35dB will be in an ensuite beside a master bedroom