Often being chosen for their architectural accuracy, elegance or physical strength, steel framed windows continue to be able to satisfy the full requirements of the Building Regulations, thanks to the detailed development work that the Steel Window Association has carried out, according to the trade body.<br> <br> As a result of the SWA's latest phase of physical advancements to the W30 systems' thermal insulation performance and independent testing of specimen windows, it has now achieved the BFRC B rating standard and is able to satisfy the requirements of the revised Part L covering new build properties, the association says. <br> <br> Much of the development work has been carried out by long term SWA member, NSB Casements, in consultation with the association's technical committee. Testing has been conducted at the BFRC's own facility.<br> <br> NSB Casement's David Northam explains: "The Steel Window Association has always been active in helping its members keep pace with technological change and to meet all requirements necessary in the new build as well as refurbishment markets, which is why this important programme of development work has been undertaken."<br> <br> www.steel-window-association.co.uk