The British Fenestration Rating Council is the UK’s most trusted rating council for verifying the energy performance of windows and doors. Genuine BFRC rated products are labelled with a small official sticker on the inside of the frame and often a large rainbow label on the surface of the window or door: clear, visible proof that they will perform as promised. The BFRC energy rating label looks very similar to other rating schemes which you may have seen on a range of products, from domestic white goods to car tyres. The bandings on the BFRC label are the result of a complex calculation which takes into account a standard size of window, standard building occupancy and average climate conditions. Windows and doors with an energy rating of 0 or higher (Ratings A to A++) are considered to be energy positive. As with all energy rating labels the performance indicated provides a method of comparing one product against another.