Window Energy Ratings is a scale designed by the British Fenestration Ratings Council to measure the thermal performance of windows. The window energy ratings (WER) scale runs from A to G, with A being awarded to the most energy efficient windows. The WER take into account the U-Value the solar heat gain (G Value) and the air leakage rate of all the components of the fitted window. The overall performance is therefore dependent on the combined efficiency of the frame, double glazed units, components and the air tightness of the finished windows.
Low E windows with the highest performing energy ratings, capable of achieving an A on the WER scale, use a combination of low E glass, with warm edge space bars and argon gas filled cavity, all within an hermetically sealed double glazed unit.
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