Acquired 2 units for our front bedrooms as we are on a noisy key road. Put in them yesterday and the difference in noise is remarkable. I went for the six.4mm laminated glass and positioned the models over the front on the window sill to provide utmost hole. Excellent https://codypiymw.elbloglibre.com/34622371/the-single-best-strategy-to-use-for-secondary-glazing-london