By definition, high-performance windows need to perform better than conventional window systems. This applies in several ways. First their inherent internal structure must be adequate and appropriate to the installation and the wind, water, and other loading stresses it will encounter. Building codes usually dictate minimum performance requirements in this regard, but there can be many instances where a higher level of structural performance is required to provide greater protection against natural forces such as hurricanes or earthquakes or against man-made forces such as blast resistance.

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