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On all levels below high setting, its barely audible. On the highest setting, its lower than a floor fan. After awhile, it simply becomes ambiant noise that you don't notice. Sorry I don't have the actual decibel numbers.
Sorry, there was a problem. Please try again later.Thank you for your interest in Blueair! Our Blue Pure 311i Max air purifier is Quiet Mark certified, delivering clean air with minimal noise at just 23–50 dB, all while capturing 99.97% of airborne particles. I hope this information is helpful! For more product details, please visit our website: https://www.blueair.com/products/blue-pure-311i-max
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