Acquired 2 models for our front bedrooms as we've been on a noisy main street. Mounted them yesterday and the real difference in noise is remarkable. I went for the six.4mm laminated glass and positioned the models within the entrance in the window sill to offer optimum hole. Provided https://10-most-expensive-cities16890.sharebyblog.com/34443840/fire-rated-secondary-glazing-can-be-fun-for-anyone