Extremely quiet. Whisper quiet.
[[VIDEOID:d6ed50e759ba65d5fa2bf12c23121b0e]] I have been using this air filter for about a week now. I have 3 dogs, and a cat, so allergies especially during summer with them shedding can be a problem. I would have never guessed that an air filter could make this much difference for my family. On the lowest setting, it is whisper quiet. The display also shuts off after a minute, so it is not distracting in the bedroom, or livingroom under my TV. I definitely plan on ordering more to keep one in each bedroom as well. I highly recommend. The filter is easily accessed and changed.
Rating: 5 stars