Purchased 2 models for our entrance bedrooms as we've been on a noisy major road. Mounted them yesterday and the primary difference in noise is remarkable. I went for the six.4mm laminated glass and positioned the units about the front of the window sill to provide maximum gap. Excellent customer https://vegan-make-up-skin-care28406.collectblogs.com/72503282/fascination-about-noise-reduction-windows-in-chelsea