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First you should know is that the sound is measured in decibels (db), on a scale that starts from 0db (sound so low but you do not hear anything) to 120db (sound that causes pain). So that the sound does not become harmful to your health, you have to take into account 2 variables to consider. The acoustic power  of sound which is measured in decibels. The exposure time of  it As for the acoustic power, any vacuum cleaner that really stays between  60-70db  can be classified as silent. The logical conclusion to which you must arrive is to  limit to the maximum the time that you will expose yourself to noise  , because if you add decibels throughout the day you will only affect your health negatively. Benefits of avoiding noise: The health problems that derive from the noise would be from hearing loss, fatigue, increased aggressiveness, loss of concentration, anxiety, hypertension, irritability and many more, so you see the importance of k...