Multiple glazed units are two or more sheets of glass separated by distance frame. The spaces between glass sheets are filled with air or inert gas. Being sealed, multiple glazed units protect premises of overcooling and overheating, increase thermal performance characteristics of the window openings, create a strong barrier against any kind of outside influence.

Applied with coated glass (heat-saving and sun-screening), multiple glazed units characteristics correspond to or even exceed the building regulation requirements for energy efficiency. The most common formula for commercially available multiple glazed unit is 6mm-12mm-6mm.

Note: architectural glass set into multiple glazed units with coated surface inside, mostly with outside glass.

Since the low-emission coating changes multiple glazed units emission properties and increases its heat transfer resistance performance, multiple glazed unit glass manufacturers need to reduce heat loss through so called «cold bridges», the spacers, traditionally made of aluminum with the addition of some moisture absorbent material. As high thermal conductive material, aluminum cools the glass around the perimeter, creates a temperature difference at the center and in the marginal zone of glass. All of that, in turn, leads to possibility of condensation formation and reduces heat-insulating properties of the whole structure.

Effective architectural glass coatings make it possible for manufacturers to produce translucent constructions and increase thermal resistance up to 50% and a similarly decrease solar factor compared to any plain glass. In combination with the «warm edge» design, window construction is obtained with unique energy efficiency performance.