Bought two units for our front bedrooms as we're on a loud key street. Installed them yesterday and the difference in noise is incredible. I went with the 6.4mm laminated glass and positioned the models about the front of the window sill to give highest gap. Casement Home windows Have https://led-ceiling-lights11110.blogzet.com/a-secret-weapon-for-secondary-glazing-installation-41413679