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This article from Architectural Record discusses the importance of fenestration systems in creating effective barriers for buildings. Building science has advanced to the point where manufacturers offer a range of exterior barrier products that can meet specific performance needs, such as limiting airflow, resisting water, and controlling thermal properties. Fenestration systems, including entrances and movable glass walls, can play a crucial role in meeting these barrier objectives when specified correctly. The choice of which products to use is determined by the architect or designer of a project. The article also provides learning objectives for readers, including recognizing the safety and performance characteristics of fenestration systems and assessing their contributions to green and sustainable design. [Extracted from the article]