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Quite on Low setting and actually somewhat quiet even on High. The 4 speed fan doesn’t move air like an annoying hum of a box fan, it’s not loud like a hair dryer on High. On the 2nd speed setting, it’s as quiet as a quality bath fan, maybe 1.5 sone or so. Doesn’t keep me awake at night on Low or interfere with hearing tv on High. They should rate these fans and any fan for that matter, like they do for bath fan noise.
Sorry, there was a problem. Please try again later.This air purifier is very quite, especially at the lower fan speeds. The decibels for each fan speed are as follows: Sleep 27.8 dB, Low 30.8 dB, Medium 35.7 dB, High 47.4 dB and Turbo 54.8 dB.
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