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What is the difference between Design Pressure, Performance Grade, and Structural Test Pressure

The terms "Design Pressure", "DP," "Performance Grade," "PG," and "Structural Test Pressure," "STP" have in the past been loosely used by some in the field.  This answer will clarify what the differences are between them.

Tags: AAMA, design pressure, NAFS, performance grade, structural test pressure

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What's the Difference Between Design Pressure, Performance Grade, and Performance Class?

Standards in the door and window industry are constantly evolving due to changes in technology, building codes and rating system performance requirements. This has led to some confusion around the differences between Design Pressure, Performance Grade, and Performance Class.

Tags: AAMA, design pressure, DP rating, performance class, performance grade, window testing

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