I will share with you a supplemental determine I am aware of and that is a reduction of 10 dB, but make sure you, will not choose this as Solid in stone due to wildly different situations of sash windows, also to me the determine is nearly useless because of this and if noise pollution is of seri

Then incorporate a mixture of blinds and curtains. You may use a window plug to muffle noise after you don’t need usage of the window and then get it out whenever you do.

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