BFRC

The British Fenestration Rating Council is the organisation who designed the window rating system

To verify the WER’s please visit www.bfrc.org and look for Sternfenster

A - G scale

The scale used to rate the windows based on their energy efficiency, A being the most energy efficient. The WER assesses the whole window energy performance, covering the frame material, the frame design, the glass type and the components that make up the window. Computer simulations are used to generate the WER which takes account of solar gain (G factor), thermal transmittance (U value) and air permeability (L factor).

Energy Saving Recommended Label

Windows with a C rating or higher can carry the blue energy saving recommended label, awarded by the Energy Saving Trust.