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Our 4200 Maxi Argon gas filled and 5400 Maxi Krypton gas filled have a fully welded main-frame, fully welded sashes, advanced weather-stripping, warm edge Super Spacer, aluminum reinforcement, triple glazed glass, 2 panes of Soft Coat Low E titanium coated glass and double action locking system and FOAM! The primary benefit of foam is to prohibit conductive heat transfer losses within the frame and sash profiles. Polyurethane foam, the same type that insulates your refrigerator, keeps your cooler cool and your Thermos hot is now keeping your windows insulated which means higher energy savings and an increase in efficiency due to its FOAM core. Our windows can be installed as Replacement Windows and in New Construction.