Technical Booklet F1 Conservation of Fuel and Power in Dwellings·Page 48·3.48
Window Energy Rating Label Bands
Windows are classified into seven performance bands (A through G) based on their calculated WER value, with Band A being the highest performing.
The following window rating bands define the window energy rating label –
Band A WER ≥ 0
Band B 0 > WER ≥ -10
Band C -10 > WER ≥ -20
Band D -20 > WER ≥ -30
Band E -30 > WER ≥ -50
Band F -50 > WER ≥ -70
Band G -70 > WER
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