First ‘A+’ door

sapaSapa Building Systems has claimed that its Crown 98mm aluminium sliding door is the very first door on the market to be awarded an ‘A+’ Door Set Energy Rating (DSER) by the British Fenestration Rating Council (BFRC).

The global aluminium systems company launched the door in 2012 when it was reportedly the first in its class to be awarded an ‘A’ DSER. At this time, it had already been tested and reached a positive energy balance of 10 or more, which is the requirement for the new ‘A+’ rating.

“It was a case of the ratings system having to catch up as the Crown 98 was designed as a high performance door to meet the most stringent standards,” said Paul Booth, chief designer at Sapa Building System.

“As with the ‘A+’ Window Energy Rating (WER), the introduction of the ‘A+’ DSER shows that the BFRC acknowledges the advancements which have been made in energy performance and the increasing number of fenestrations systems that now offer the highest possible energy efficiency. Also, with thermal performance criteria under the Building Regulations only likely to get tighter, Sapa is ideally placed to be able to respond to this.”

The top rating is said to be achieved through the door’s slim sightlines, which increase the glazed area allowing maximum light into the building, and thermal break technology which reduces the heat transferred from inside to outside. As well as the top DSER, the door also achieves a low U-value of 1.4W/m²k with double glazed units.

For more information contact Sapa Building System on 01684 853500 or email

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