Are windows designed for specific exposures (e.g. building in a well-protected location versus building on a bluff)?
Window products are designed to perform in various applications and weather conditions/exposures. Manufacturers can certify the performance grade of their products through independent testing laboratories. These certification programs define window products by performance class (residential, light commercial, commercial, heavy commercial, and architectural) and performance grade (15, 20, 25, etc.). Local building codes likely define the minimum performance grade. When choosing a product for a specific structure, it is important for the buyer to take into account issues such as the building’s design and exact location. Structure location determines general weather exposure and protection. For instance, a structure on a bluff may need a higher performance grade than one protected by wind breaks. The size and height of a building are also a consideration. Architects and your local building code department are excellent resources to discuss performance classes and grades. We recommend you
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