The British Fenestration Rating Council (BFRC) energy performance label can help you determine how well a product will perform the functions of helping you contain and conserve heat within your building in the winter, cool it in summer and keep out the wind and resist condensation. Each rating label is specific to a manufacturer and is non-transferable. The BFRC Certificate Number relates to the specific certificate and details of the certificate can be obtained from this web site. The BFRC rating is provided for a standard window to represent typical window sizes (1.48 x 1.23 m.) which enables comparison between different products. Among the 65 five labels in the “A” category, one is attributed to an aluminium frame, 4 to timber frames and 60 to PVC frames.