An insulated glass window commonly consists of two (sometimes more) panes of glass separated by a spacer material and sealed together at the edge. The insulating airspace is filled with air or a noble gas, such as argon or krypton inside. Each glass pane has two surfaces, so typical double-paned IGUs have four surfaces.

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320 Great rd 
Littleton MA, 01460
(978)339-5437 P
(978)339-5438 F