Window Energy Rating Certification

BM TRADA is approved as an Independent Agency for the BFRC (British Fenestration Ratings Council). Our Window Energy Rating Certification scheme allows manufacturers to apply to use the energy rating label on their products (pictured right).

Conventional approaches (such as setting a glass or window U-value) simply assess how much energy a window loses. They do not take into account how much energy a window can gain.

The total energy flow in a window consists of three major components:

  • Thermal transmittance (U-value)
  • Solar factor (g-value)
  • Air Leakage (L50)

The British Fenestration Ratings Council (BFRC) has devised a Window Rating equation based on values for these components. The rating is expressed as a number. The rating is converted into a grade between A and G (with A being the most energy efficient).

What is the Window Energy Rating System?

Achieving Window Energy Ratings

View all members of the Window Energy Rating Certification scheme

View all provisional members of the Window Energy Rating Certification scheme

For further information please call our head office on 01494 569 700 or email enquiries@bmtrada.com. We will be happy to advise you on the most cost-effective route to registration.