Our 4200 Argon gas filled and 5400 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 convective heat transfer
losses within the frame and sash profiles. Polyurethane foam, the same type that insulates your refrigerator, keeps your cooler cool and your ThermosŪ hot is now keeping your windows insulated which means higher energy savings and an increase in efficiency due to FOAM core.
