Bought 2 models for our entrance bedrooms as we have been on a loud key street. Mounted them yesterday and the primary difference in noise is awesome. I went for your six.4mm laminated glass and positioned the units on the front from the window sill to offer maximum hole. Clearview https://martinqjymz.mdkblog.com/32443996/top-latest-five-chelsea-secondary-glazing-solutions-urban-news