THE SINGLE BEST STRATEGY TO USE FOR NOISE-REDUCING GLAZING SYSTEMS

You can find great outcomes with simply a 4mm glass, using an air hole of 150mm you may reach a 48dB sound reduction.Easy to adhere to instructions for choosing right item (a secondary glazing panel) and measuring to get accurate in shape. I did telephone with a query and spoke to someone very polite and handy. Product or service just as explained.