Purchased two models for our entrance bedrooms as we have been on a noisy primary road. Mounted them yesterday and the real difference in noise is awesome. I went for your 6.4mm laminated glass and positioned the models over the front in the window sill to give most hole. My https://brooksjjfbv.arwebo.com/49900444/the-smart-trick-of-secondary-glazing-noise-reduction-that-nobody-is-discussing