Performance Data

Definitions:

Window Energy Rating (WER): Represents how windows with different glazing types would perform in most leading PVC-u, timber or aluminium window frames .

Thermal insulation: A measure of the rate of heat loss of a typical PVC-u window (W/m²K). A principle reason for buying energy efficient windows, the lower the u-value the better the window is at retaining heat.

Virtually eliminates internal condensation: A combination of high performance glass and a warm edge spacer bar ensures virtual elimination of internal condensation.

Optimum solar heat gain: An optimum amount (70-75%) of the sun’s energy passing through the window into the room is important in order to benefit from this free energy source, but without the room overheating in the summer. Works best when coupled with a good thermal insulating glass to keep the heat in the room. 

Natural light: The more natural light that enters a room through a window the lighter and brighter interiors appear.  However, unlike with the advanced coating technology of EcoClear+, some glass coatings can have a small but discernable tint which reduces the transmission of natural light.