National Fenestration Rating Council

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Performance Test Standards Questioned for Insulated Glass

A wider airspace between glass panes appears to boost the efficiency of windows in Europe, so why hasn't the U.S. followed suit? More

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Optimizing Windows

Spot-specing windows based on their orientation--rather than installing a houseful of the same model--can have a significant impact on efficiency and homeowner comfort. More

Product Review: Windows
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Product Review: Windows

Spot-specing windows based on their orientation--rather than installing a houseful... More

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The National Fenestration Rating Council's Component Modeling Approach Product Certification Program Is Implemented

The pilot program, which awards product energy performance ratings for commercial projects, was officially implemented in January More

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