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What is a WER?
A Window Energy Rating (WER) is measurement and category for the efficiency of a window system as a whole. It considers the frame, the centre pane U value, the solar transmission of the glass, the effect of the spacer around the edge of an insulating glass unit and the air permeability of the window. It can be used to demonstrate compliance with the building regulations for energy efficiency and the simple code allows consumers to know the relative efficiency between products.
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