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When I got this, I anticipated a quiet fan, as it advertises 37 dB. For those not familiar, that's between a whisper and the sound a refrigerator makes. This fan was far louder than that, about on par with a car idling (it's in my garage after all). Using an app that measures decibels, the room was at 40 dB, and then when the fan was on the volume went up to 60 dB. That's on the lowest speed setting, for those wondering. Too loud to talk over without shouting. Loud enough I hear easily hear it in the next room with the door closed between. Loud enough I contacted Vivosun to see if something was wrong, and they never responded after over a week. Also, no instructions for assembling (though it's pretty straightforward, except for squeezing the ducting onto the carbon filter flange). Only reason I gave it 2 stars is because it does seem to work well at filtering odors.
Unit performs as advertised, the mount bracket was misprinted so flow indication is printed as a "mirrored" imaged (everything reversed) don't know if that's intentional or a mfg. defect. The cord is way too short for anything beyond a basic install (basic being able to plug into and outlet that is close) and an extension is needed.