BFRC window rating scheme WER
The BFRC scheme is an Window Energy Rating (WER) scheme. It is based on a traffic-light style A-G ratings system for energy efficiency similar to that used for fridges, washing machines, cookers and so on. An A rating indicates a good level of energy efficiency, whilst G is the lowest possible rating.
Rated windows are provided with labels that include information about:
- The rating level of the window, from A-G.
- The energy loss rating in kilowatt hours per square metre per year.
- A U-value, indicating the thermal conductivity of the window.
- The effective heat loss due to air infiltration in W/m²K.
- Solar heat gain as a ratio of incident to transmitted solar radiation.
The label gives an overall indication of how energy efficient the window is, how much air it will allow to penetrate into a building, the likelihood of condensation and the level of acoustic insulation and so on. It can also be used to demonstrate building regulations compliance for replacement windows.
The efficiency of windows is improved by double glazing, treble glazing, low-e coatings, the construction of the frame, the type of glass, the gas used to fill the sealed unit and so on. Generally, more efficient windows are more expensive, but the capital cost may be recovered during the life of the window life through lower energy bills. In addition, the conditions within the enclosed space are likely to be more comfortable.
In September 2011 BFRC launched a Door Energy Ratings Scheme (DER).
 Related articles on Designing Buildings Wiki
- Door energy rating.
- Energy certificates.
- Low-e glass.
- Shading coefficient.
- Solar heat gain coefficient.
- Thermal bridge.
- U value.
- Window parts.
 External references
Featured articles and news
MVRDV reveal designs for a strange holiday villa in Taiwan.
New milestone achieved with launch of new safety lanyard for working from height.
A quick introductory article about preliminaries in construction.
Brandenburg Gate - an historic structure that went from symbolising German partition to European unity.
A discussion between construction key players and leading insurers on the future outlook for construction insurance.
New guide from BSRIA on building performance evaluation in domestic buildings.
Rogers Stirk Harbour and Partners complete new trio of towers at Sydney Harbour.
With a new government consultation underway, ICE look at creating a smarter, more flexible energy system.
International Ethics Standards Coalition publishes first set of ethics principles for built environment professionals.
British Antarctic Survey announces research station is to relocate 23km due to growing crack in the ice shelf.
A great example of mimetic architecture with the Fish Building of India.