All of our patio doors come standard with LoĒ-180 glass with Argon from Cardinal. It is a glass coating with a thin, clear layer of silver between layers of anti-reflective metal oxide coatings. A protective coating is applied to assure durability and long life, which is invisible to the naked eye, like looking through clear glass. It also provides excellent insulating capability, and is the ideal choice for comfort, reliability, and energy savings.
