Low-E 4th Surface Technology
Low-E 4th Surface Technology is a revolutionary way to obtain energy-efficient glazing and indoor comfort by significantly improving thermal performance. With low-e coatings applied to the #2 and the #4 surfaces of an insulating glazing unit, you can reduce the center-of-glass U-Factor by 21%, compared to a unit with a pyrolytic low-e and a clear lite.
Low-e 4th Surface Technology allows double-glazed insulating glass units to achieve 12% better thermal performance than clear glass triple-pane units.
How does it work?
In cold weather conditions, the coating on the #2 surface reduces room heat (or infrared heat) from transferring across the airspace, toward the outside. By adding a second low-e coating to the #4 surface the thermal insulation is further improved.
A low-e coating on the #4 surface reflects room heat, back inside during cold weather conditions. This reduces the radiant heat loss and improves the overall insulation of the insulating glazing unit.