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A double glazed sealed unit is the only external component on the building envelope that is sealed! the walls are cavity and have and air flow through them, the roofs are vented and have an air flow through them, even wood floors are vented why? To prevent the build up of moisture and humidity...

Hi The window energy rating (wer) sticker on the frame is fitted by the manufacturer and if it states c they are c rated, this means that the whole frame and glass construction is tested and conforms to the minimum standard "c". If you ordered A rated frames they will need removing and...