29 May '12, 1pm

Great @bglive article that discusses how window testing standards differ between US and Europe.

Product Review from Environmental Building News European Windows for Passive House Buildings The National Fenestration Rating Council (NFRC) was established in the U.S. in 1989 to standardize the testing and reporting of window energy performance. Prior to the formation of NFRC, window manufacturers used different methods to report their performance. Consumers and specifiers couldn’t compare apples to apples. Among the most important performance metrics to be addressed by NFRC was the U-factor, the amount of heat flow through a whole window unit under certain testing conditions. U-factor is the inverse of R-value, and until NFRC came along, manufacturers most commonly reported energy performance as the center-of-glass R-value. ... To read the complete article, please login below. To continue reading this article, please log in — or, subscribe and get immediate access! Memb...

Full article: http://www.buildinggreen.com/auth/article.cfm/2012/4/30/E...

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