Environmental Conditions for Human Occupancy

ANSI/ASHRAE Standard 55-2004(Supersedes ANSI/ASHRAE Standard 55-1992)ThermalEnvironmentalConditions forHuman OccupancyApproved by the ASHRAE Standards Committee on Janu-ary 24, 2004; by the ASHRAE Board of Directors on Janu-ary 29, 2004; and by the American National StandardsInstitute on April 16, Standards are scheduled to be updated on afive-year cycle; the date following the standard number isthe year of ASHRAE Board of Directors approval. Thelatest copies may be purchased from ASHRAE CustomerService, 1791 Tullie Circle, NE, Atlanta, GA : Fax: 404-321-5478. Tele-phone: 404-636-8400 (worldwide) or toll free 1-800-527-4723 (for orders in and Canada). Copyright 2004 American Society of Heating,Refrigerating and Air-Conditioning Engineers, 1041-2336 When addenda or interpretations to this standard havebeen approved, they can be downloaded free of chargefrom the ASHRAE web site NOTEThis American National Standard (ANS) is a national voluntary consensus standard developed under the auspices of the AmericanSociety of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).

spaces designed for human occupancy for periods not less than 15 minutes. 2.4 This standard does not address such nonthermal envi-ronmental factors as air quality, acoustics, and illumination or other physical, chemical, or biological space contaminants that may affect comfort or health. 3. DEFINITIONS

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