BFRC (the UK’s national system for rating Energy Efficient Window) has warned that trade and consumer advertisements have been appearing featuring the claim "A-rated glass as standard" or similar, even though there is no such thing as "A-rated glass." "There is no scheme in the UK that rates glass in isolation," BFRC technical director Dr G Morgan said. "All WER schemes operate in an identical way - rating the whole window including glass, frames, spacer bars and gaskets. It is not possible under current EU regulations to provide an energy rating for glass in isolation from the other window components. "While it is true that certain glazing specifications are widely used in "A" and "A+" rated windows, the glazing itself does not guarantee an "A" or "A+" rating for the whole window. The frame system also has to be thermally efficient to enable the complete window to obtain a favourable rating."
