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Generally, exposure to sound levels above 85 dB is considered damaging to human hearing. That is why this is the most common maximum value allowed in industrial environments. For residential environments, the accepted decibel level is lower. Any noise exceeding 70 dB is considered disturbing.
30 dB: Whispering nearby. 40 dB: Quiet library sounds. 50 dB: Refrigerator.
There is not a limit on maximum noise. The statutory limits for a residential location are L10 = 65 dBA and L50 = 60 dBA during the daytime ( a.m ? p.m.) and L10 = 55 dBA and L50 = 50 dBA during the nighttime ( p.m. ? a.m.) (Minn. State Noise Pollution Control Rules 7030.0040).
Tips for using sound to fall asleep Try to keep your white noise volume to 50 decibels or lower. Set a timer if you can. Too much noise consistently while you sleep may be disruptive to your sleep quality and hearing abilities.
50 dB is as loud as a quiet conversation, a quiet suburb, a quiet office, or a quiet refrigerator. Notice the use of the word 'quiet' when describing this noise level?
No person shall operate any domestic power tool between the hours of p.m. and a.m. in a distinctly and loudly audible manner as to unreasonably disturb the peace, quiet and comfort of any person nearby.
50dBA is incredibly noisy for a fan. I also like to keep my fans to below or near 20dBA if possible. The incredibly noisy Fulltech fan you link to does 175 m3/h, which is quite a bit more, but even slowing it down to something equivalent will not net you anything bearable.
Measuring sound transmission 30 dB has little sound-control effectiveness. 35 dB allows normal conversation to be heard through the wall. 40 dB allows loud conversation to be heard through the wall. 50 dB will prevent loud conversation from being heard through the wall.