Acquired 2 units for our front bedrooms as we are on a loud major road. Mounted them yesterday and the real difference in noise is astounding. I went with the six.4mm laminated glass and positioned the units over the front from the window sill to present highest gap. Many thanks https://noise-reduction-solutions00987.blogdiloz.com/26468490/5-tips-about-energy-efficient-glazing-in-sw3-you-can-use-today