![]() ![]() Refined exceptions related to vestibules, added new option and associated criteria for using air curtains.Revised air leakage section to clarify compliance.Upgraded minimum criteria for SHGC and U-factor across all climate zones.Combined categories of “nonmetal framed” and “metal framed” products for vertical fenestration.New commissioning requirements in accordance with ASHRAE/IES Standard 202.Significant changes to requirements include the following ![]() The 2019 edition includes various modifications and clarifications to improve internal consistency and to standardize the structure and language of the document. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems. ![]() It offers, in detail, the minimum energy efficiency requirements for design and construction of new buildings and their systems, new portions of buildings and their systems, and new systems and equipment in existing buildings, as well as criteria for determining compliance with these requirements. This standard provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings. Standard 90.1 has been a benchmark for commercial building energy codes in the United States and a key basis for codes and standards around the world for more than 35 years. ![]()
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May 2023
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