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How is the effect of glass curtains reduce the noise? May 30, 2018

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When the balcony sashes are all open, the interior is 42-46 decibels and the balconies are 73-77 decibels; when the sashes are all closed, the interior is 37-38 decibels and the balconies are 67-68 decibels. It can be seen that the balcony window can reduce the rumbling sound by 10 db, which is equivalent to reducing the arpeggio intensity by ten times. For the human ear, the balcony window is twice as quiet as when it is opened. In addition, the clutter of various traffic vehicles can reduce the clutter of 4db to 1db.