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PHI window certification: previous success and new climate zones

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ouse was just getting started was that there were not yet any windows on the market with high enough q... evelop high-quality windows for market launch. By now, more than 130 windows have been certified in 23... U-value than the glazing and, on the other hand, no direct solar gains are possible through the frame... ning Class A+); except for a few aluminum frames, no products were designated Class phC in 2012 and 20