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U4 - 4th surface technology
Position Yourself Ahead of the Energy Performance Curve
U4 - 4th Surface Technology is a true game-changer for your insulating glass windows, improving your total window U-value performance by 0.04 or more, without changing your manufacturing processes. Now, you’ll be able to exceed the new ENERGY STAR® standards and still maintain your competitive edge. It's all part of AGC's commitment to developing innovations that keep you ahead of the curve.
How does it work?
Adding a low-e coating to surfaces #2 and #4 of an insulating glass unit allows the window to reflect energy both to the outside and inside. The coating on surface #2 will reflect solar energy to the outside when the sun is shining. During cold conditions, the coating on surface #4 will reflect energy back into the room. This reduces the amount of energy transferred across the airspace, therefore improving the overall insulating properties of the glass by an additional 15%-20% versus a conventional low-e unit.