Our 4200 Argon gas filled and 5400 Krypton gas filled has a fully welded main-frame, fully welded sashes, advanced weather-stripping, white warm edge spacers, aluminum reinforcement, triple glazed 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.
