The British Fenestration Rating Council (BRFC) window efficiency rating is a voluntary scheme used in the window industry, in which the whole window (the frame and the glass) is assessed on its efficiency at retaining heat. The rating uses a consumer-friendly traffic-light style A-E ratings guide, similar to the efficiency rating put on appliances.

The label will display the following information:
1. The rating level – A, B, etc
2. The energy rating eg. -3kWh/(m²•K) in this example the product will lose 3 kilowatt hours per square metre per year
3. The window U value eg. 1.4W/(m²•K)
4. The effective heat loss due to air penetration as L eg. 0.01 W/(m²•K)
5. The solar heat gain eg. g=0.43

Energy efficiency savings - Having an energy efficient double glazing fitted will save the average household around £140 a year on its fuel bills, according to the Energy Saving Trust.

For more information visit www.brfc.org

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