Transcription of Differences in Design Pressure and Performance Grade
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Differences in Design Pressure and Performance Grade
Door& to Some BasicsDifferences in Design Pressure and Performance GradeB Y K E N B R E N D E NFenestration products areundeniably becoming morecomplex as performanceexpectations diversify and same is true of the standardsthat guide those who Design andspecify these products. The lynch-pin of these standards is theAAMA/WDMA/CSA 101 , The North AmericanFenestration Standard/Specification[NAFS] for Windows, Doors andSkylights, the latest version ofwhich is 2008 although the 2011version is waiting in the wings foradoption into the 2012 is apparent widespreadmisuse of certain NAFS perform-ance terms within the industry,especially Design Pressure per-formance class and performancegrade. At times, marketplace con-fusion has led to specifying thewrong product for a given build-ing application.
d o o r & W I N D O W m a N F a C R E R 20 www.dwmmag.com pressure applied for structural per-formance verification is 150 per-cent of design pressure for doors and windows and 200 percent for
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