Differences in Design Pressure and Performance Grade

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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.

unit skylights and tubular daylight devices. This is a test that assesses any permanent damage associated with the assembly; b) Water penetration resistance: The water penetration resistance test pressure, which simulates the force behind wind-driven rain, is generally is based on 15 percent of the design pressure for R, LC, and CW performance ...

  Performance, Design, Pressure, Grade, Differences, Tubular, Skylight, Differences in design pressure and performance grade