Bought two models for our front bedrooms as we've been on a noisy principal highway. Mounted them yesterday and the real difference in noise is wonderful. I went to the six.4mm laminated glass and positioned the units over the entrance of the window sill to provide utmost gap. Conservation place https://hallee420yoq3.ja-blog.com/26876807/5-simple-techniques-for-secondary-double-glazing-benefits