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The sound insulation of doors and windows is very important for the indoor sound environment, but the material and thickness of the outer wall can not be ignored, because the material and thickness of the outer wall will directly affect the sound insulation of the wall. If the sound insulation of your wall is not enough, the effect of only installing wooden casement windows will not be good. Therefore, sound insulation treatment shall also be carried out for the wall. For example, for the rooms along the railway and around the airport, when selecting sound insulation windows, attention shall be paid to the sound insulation loss of more than 40dB,

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