No more car or truck engines, only a hum or hiss. We had been able to provide a 5 inch airgap for the back again of the exterior double-glazed windows, and the secondary body and panes are not from the minimum clear. We'll be buying from you for another two https://judahbyrly.bloggazzo.com/26059330/noise-reduction-windows-in-soho-no-further-a-mystery