Technology behind quality windows and doors is always evolving and improving, so we put together a glossary to help you understand some of the industry lingo. Save this post so you can keep an eye out as we add to this list of windows and glass terminology! Call today or send us a message to learn about Metropolitan's premium windows and doors - exceeding leading industry standards. (800) 995-8878 | http://www.mhiwindows.com/about-us/