Acquired two units for our entrance bedrooms as we are on a noisy primary street. Mounted them yesterday and the difference in noise is wonderful. I went with the six.4mm laminated glass and positioned the models around the front of your window sill to present most gap. Secondary glazing is https://earandfacialhairtrimmerfo11008.creacionblog.com/26729638/fascination-about-retrofit-double-glazing-in-london-sw3