NFPA 257: Standard on Fire Test for Window and Glass Block Assemblies
Current Edition: 2012 Next Edition: 2017

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NFPA 257:
2012 Edition
Item #: 25712
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The next edition of this standard is now open for Public Input (formerly proposals).

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What is NFPA 257?
NFPA 257: Document Scope
1.1 Scope. 1.1.1 This standard prescribes standardized fire and hose stream test procedures that apply to the evaluation of fire window assemblies, including windows, glass block, and other light-transmitting assemblies intended to retard the spread of fire through openings in fire resistance–rated walls. 1.1.2 This standard is not to be construed as determining the suitability of fire window assemblies for continued use after fire exposure. 1.1.3 This standard provides a standardized method for comparing the performance of fire window assemblies.
This document advances fire safety by establishing test protocols to measure how well window and glass block assemblies prevent or slow the spread of fire, providing a standardized method for comparing the relative performance of different fire window assemblies. Official document scope
What does NFPA 257 address?
The standard prescribes fire and hose stream test procedures that apply to fire window assemblies -- including window, glass block, and other light-transmitting assemblies -- intended for use in window openings to retard the spread of fire through openings in fire-resistive walls. It covers controls of the fire test as well as performance criteria and results for reporting procedures.Table Of Contents.
NFPA 257, 2012 Edition: Archived Revision Information
Report on Proposals (ROP)
Report on Proposals (ROP)
Proposals can be submitted for text to be amended or included in NFPA Codes and Standards. Following the Call for Proposals period, the responsible Technical Committee or Panel holds a meeting to consider and act on all submitted proposals. The committee or panel may also develop its own proposals. A document known as the Report on Proposals (ROP) is prepared containing all the Public Proposals, Technical Committees' action on each Proposal, as well as all Committee-generated proposals. The ROP for the document in question is submitted for the approval of the responsible TC or Panel by a formal written ballot. If the ROP does not receive approval via written ballot in accordance with NFPA rules, the Report is returned to the committee for further consideration and is not published. If the necessary approval is received, the ROP is published in a compilation of Reports on Proposals issued by NFPA twice yearly for public review and comment, and the process continues to the next step. The ROP is published and widely distributed and anyone may download or request a copy.
ROP Meeting Notice
ROP Meeting Notice
Note: Please contact the appropriate staff liaison (listed on the Technical Committee tab) for information on attending an NFPA Technical Committee meeting as a guest. Read NFPA"s Regulations Governing Committee Projects (Section 3.3.3.3) for further information.
August 16-17, 2010, Baltimore, MD, Embassy Suites Baltimore, (401) 865-8144
ROP Meeting Agenda
ROP Meeting Minutes
ROP Ballot
ROP Ballot
The ballots posted on this page are for public information only. Voting on ballots is permitted by committee members only. See NFPA Regulations Governing Committee Projects, Section 3.3.4.
Ballot (PDF, 155 KB)
Ballot Circulation (PDF, 155 KB)
Ballot Final (PDF, 163 KB)
ROC Meeting Notice
ROC Meeting Notice
Note: Please contact the appropriate staff liaison (listed on the Technical Committee tab) for information on attending an NFPA Technical Committee meeting as a guest. Read NFPA"s Regulations Governing Committee Projects (Section 3.3.3.3) for further information.
ROC Meeting Agenda
ROC Meeting Minutes
Motions Committee Report (NITMAM)
Motions Committee Report (NITMAM)
Proposed NFPA documents will be presented for action at the applicable Annual (June) Association Technical Meeting only when proper Amending Motions (Notice of Intent to Make a Motion - NITMAM) have been certified by the Motions Committee of the Standards Council as a proper amending motion. Documents that receive no motions will not be presented at the meeting and instead will be forwarded directly to the NFPA Standards Council for action on issuance. More about the codes and standards making process including NITMAM.
No NITMAMs
Association Technical Meeting
Consent document not presented at Association Technical Meeting. Document issuance by Standards Council: 12/13/2011
Archived revision information
NFPA 257, 2012 Edition: Archived Revision Information
View archived proposals, comments and other records related to the development of this edition.
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