Noise reduction percentages might be deceptive, and like stats, can lie. The fundamental difficulty could be the human ear. Since the environment will get quieter, the ear becomes far more delicate to noise. This means that some of the noise reduction delivered is dropped. For additional pics and information https://stainless-steel-slanted-t90110.ivasdesign.com/56640574/not-known-details-about-sound-insulation-windows