What recent requirement has been made regarding windows and glazing in some doors?

The recent requirement concerning windows and glazing in some doors focuses on the inclusion of a low emissivity (low E) coating. This type of coating is designed to reduce the amount of infrared and ultraviolet light that can pass through glass without compromising the amount of visible light transmitted. This aspect of low E coatings is essential in improving energy efficiency, as they help to reflect heat back to its source. For instance, in colder climates, a low E coating keeps heat inside, while in warmer climates, it reduces the amount of heat entering the building.

The requirement for low E coatings is part of a broader trend toward energy efficiency. Increasingly, building codes and standards advocate for components that contribute to better insulation and reduced energy consumption, which is why this particular choice is emphasized in recent guidelines.