STC stands for Sound Transmission Class which ranking will show you accurately exactly how much noise an item will take in and/or reflect. Try to find it on the internet or on item labels while you shop. Superb customer support, they might not are actually more valuable. Our new window https://cesardyocq.fare-blog.com/26957811/helping-the-others-realize-the-advantages-of-chelsea-secondary-glazing-solutions