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Energy Rating 

The Twentyfour-seven system from Swish is one of the most modern and energy efficient profile systems available. 
C Window Energy Ratings may be a minimum standard requirement now but why settle for just a C rating? With Twentyfour-seven, you can fabricate the full range of windows including the new A+ rating. 
In addition we offer a unique tool to allow you to demonstrate compliance on any number of window specifications. Our easy to use, U-ComplyN calculator, is an online tool which allows fabricators to calculate the thermal performance of an unlimited number of window specifications.