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31、04-1 NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169. Copyright 2017, National Fire Protection Association . All Rights Reserved. NFPA 204 Standard for Smoke and Heat Venting 2018 Edition This edition of
32、 NFPA 204, Standard for Smoke and Heat Venting, was prepared by the Technical Committee on Smoke Management Systems. It was issued by the Standards Council on November 10, 2017, with an effective date of November 30, 2017, and supersedes all previous editions. This edition of NFPA 204 was approved a
33、s an American National Standard on November 30, 2017. Origin and Development of NFPA 204 This project was initiated in 1956 when the NFPA Board of Directors referred the subject to the Committee on Building Construction. A tentative guide was submitted to NFPA in 1958. Revised and tentatively adopte
34、d in 1959 and again in 1960, the guide was ofcially adopted in 1961. In 1968, a revised edition was adopted that included a new section, Inspection and Maintenance. In 1975, a reconrmation action failed as concerns over use of the guide in conjunction with automatic sprinklered buildings surfaced. B
35、ecause of this controversy, work on a revision to the guide continued at a slow pace. The Technical Committee and Subcommittee members agreed that the state of the art had progressed sufciently to develop improved technology-based criteria for design of venting; therefore, the 1982 edition of the do
36、cument represented a major advance in engineered smoke and heating venting, although reservations over vent and sprinkler applications still existed. At the time the guide was formulated, the current venting theory was considered unwieldy for this format; consequently, the more adaptable theory as d
37、escribed herein was adopted. Appreciation must be extended to Dr. Gunnar Heskestad at the Factory Mutual Research Corporation (now FM Global) for his major contribution to the theory applied in this standard, which is detailed in Annex B. The 1985 edition again revised Chapter 6 on the subject of ve
38、nting in sprinklered buildings. Test data from work done at the Illinois Institute of Technology Research, which had been submitted to the Committee as part of a public proposal, did not permit consensus to be developed on whether sprinkler control was impaired or enhanced by the presence of automat
39、ic roof vents of typical spacing and area. The revised wording of Chapter 6 encouraged the designer to use the available tools and data referenced in the document while the use of automatic venting in sprinklered buildings was under review. The 1991 edition made minor changes to Chapter 6 to acknowl
40、edge that a design basis existed for using sprinklers and automatic heat venting together but that such had not received wide recognition. The 1998 edition represented a complete revision of the guide. The rewrite deleted the previous tables that listed vent areas and incorporated engineering equati
41、ons and referenced computer models, such as LAVENT and DETACT, to provide the designer with the necessary tools to develop vent designs based on performance objectives. This rewrite was based extensively on state-of-the-art technology published in the references. In many cases, the authors of these
42、references participated in the task groups rewrite efforts. The 2002 edition of NFPA 204 was converted from a guide to a standard, thus implementing mandatory requirements and updated language. The document was also updated to meet Manual of Style for NFPA Technical Committee Documents requirements.
43、SMOKE AND HEAT VENTING 204-2 2018 Edition The 2007 edition included a number of technical changes. New provisions on air entrainment into the re plume, the effect of wind on the location of air vents, sizing of air paths, air velocity limitations, and plugholing were provided. Information on the use
44、 of vents as air inlets and a better description of the smoke layer interface were added. Revisions with regard to how heat release rates, discharge coefcients, exhaust rates, and the number of exhaust inlets are to be determined were incorporated. Reference to international standards on vents, mech
45、anical smoke extract, and draft curtains, as well as updated annex text on recent research efforts, were provided. The 2012 edition was updated to include additional requirements and annex material for venting in sprinklered buildings. The 2015 edition included revised provisions on draft curtains.
46、These requirements created consistency with NFPA 92. The 2018 edition was updated to include a correction to an Annex A image, the addition of a denition for the term “standard,” and updated references.COMMITTEE PERSONNEL 204-3 2018 Edition Technical Committee on Smoke Management Systems Allyn J. Va
47、ughn, Chair NV5/JBA Consulting Engineers, NV SE Elyahu Avidor, Tel Aviv, Israel RT Rep. Standards Institution of Israel Carl F. Baldassarra, Wiss Janney Elstner Associates, Inc., IL SE Flora F. Chen, Hayward Fire Department, California, CA E Richard J. Davis, FM Global, MA I Kevin L. Derr, U.S. Arch
48、itect of the Capitol, DC E Kelly Eisenstein, City Of San Diego, CA E Michael J. Ferreira, JENSEN HUGHES, MD SE Donald Fess, Harvard University, MA U Maxwell French, Cosentini Associates, MA SE Brian Green, Viking Corporation, MI M Rep. National Fire Sprinkler Association Geoffrey Harris, Smoke and F
49、ire Engineering Technology Ltd., United Kingdom SE Rep. ISO TC on Smoke and Heat Control Systems and Components David A. Killian, Walt Disney Parks & Resorts, CA U William E. Koffel, Koffel Associates, Inc., MD M Rep. AAMA Smoke Vent Task Group Jeffrey A. Maddox, The Fire Consultants, Inc., CA SE Cameron J. McCartney, National Research Council of Canada, Canada RT James A. Milke, University of Maryland, MD SE Timothy J. Orris, AMCA International, Inc., IL M Rep. Air Movement & Control Association Thomas J. Parrish, Te
