The American Architectural Manufacturers Association (AAMA) recently updated its document  1506-18 “Voluntary Test Method for Laboratory Heat Build-Up Effects on Fenestration Products.” The update marks the document’s first, since it was released in 2004, describing “a standardized test to evaluate heat build-up effects due to infrared (IR) exposure on fenestration products,” according to the association.

Changes to 1506-18 include aligning section 7.3.2.1 with ASTM’s D4803, rather than G179, since D4803 is specifically for building products, officials for AAMA suggest. D4803 is also referenced in AAMA 303, “Voluntary Specification for Rigid Polyvinyl Chloride (PVC) Exterior Profiles,” which was updated by AAMA at the same time. A footnote was also removed to maintain clarity, along with a consistent and standardized testing method.
“This test method exposes fenestration products to a uniform field of IR energy directed at the product at an angle similar to outdoor exposure during the summer months in hot and dry climates in the U.S.,” says Jeff Franson, chair of the AAMA 1506 vinyl profile heat build-up task group. “Changes made to this document now mean it, and AAMA 303, are more consistent when it comes to testing.”

According to the association, the updated test method alters exterior ambient temperature and cycles the IR exposure to better simulate daytime exposure of fenestration products. This test method may accelerate dimensional and shape changes due to temperature and IR exposure cycling. The test is recommended for use on fenestration products that have a greater tendency to absorb IR energy and can be used by designers and specifiers to evaluate a fenestration product’s resistance to dimensional and shape changes that may occur due to heating by solar radiation.

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