ISO 21805:2023/Amd 1:2025
(Amendment)Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems — Amendment 1
Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems — Amendment 1
Lignes directrices et recommandations relatives à la conception, à la sélection et à l'installation d'évents pour préserver l'intégrité structurelle des enceintes protégées par des systèmes d'extinction d'incendie à gaz — Amendement 1
General Information
- Status
- Published
- Publication Date
- 21-Dec-2025
- Technical Committee
- ISO/TC 21/SC 8 - Gaseous media and firefighting systems using gas
- Drafting Committee
- ISO/TC 21/SC 8/WG 5 - General Requirements
- Current Stage
- 6060 - International Standard published
- Start Date
- 22-Dec-2025
- Due Date
- 16-Mar-2026
- Completion Date
- 22-Dec-2025
Relations
- Effective Date
- 21-Sep-2024
Overview
ISO 21805:2023/Amd 1:2025 is a critical amendment to the international standard providing guidance and recommendations on the design, selection, and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems. Published by the International Organization for Standardization (ISO), this amendment updates key references and clarifies technical requirements to enhance safety and effectiveness in fire protection.
The primary focus of the standard is to ensure that enclosures equipped with gaseous fire-extinguishing systems maintain their structural integrity during and after fire suppression events by correctly managing pressure through properly designed vents. This prevents structural damage or failure, which can compromise safety and system performance.
Key Topics
Design Guidance for Vents
The standard provides detailed recommendations on vent sizing, placement, and characteristics to accommodate pressure changes caused by gaseous fire-extinguishing agents.Selection Criteria
Criteria for selecting appropriate vent types based on enclosure size, construction materials, and the specific gaseous extinguishing system in use are discussed.Installation Practices
Guidelines ensure vents are installed securely and function optimally, considering factors like environmental exposure, enclosure design, and system integration.Structural Integrity Safeguards
Emphasis is placed on preventing enclosure deformation or collapse during system activation through controlled pressure relief.Updated Normative References
The amendment updates important cross-references to related standards ISO 6183:2022 and ISO 14520-1:2023, ensuring alignment with the latest international fire protection and equipment standards.
Applications
ISO 21805:2023/Amd 1:2025 is essential for professionals involved in:
Fire Protection Engineering
Designing and engineering fire safety systems that utilize gaseous fire-extinguishing agents in data centers, server rooms, archives, and sensitive industrial enclosures.Facility Management and Safety Compliance
Ensuring that buildings and critical infrastructure comply with international safety standards for fire suppression.Safety Inspections and Audits
Evaluating existing gaseous fire suppression systems for compliance with design and installation best practices.Manufacturers of Fire Suppression Equipment
Designing vent components that meet standardized pressure relief requirements and support system certification.
Related Standards
This amendment closely ties with the following international standards:
ISO 6183:2022
Covers specifications on gaseous fire-extinguishing system components and performance requirements relevant to vent design and structural protection.ISO 14520-1:2023
Specifies requirements for gaseous fire-extinguishing systems, including testing protocols and system design parameters impacting vent installation.ISO/IEC Directives, Part 1 and Part 2
Provide editorial and procedural rules governing the development and maintenance of ISO standards, ensuring clarity and consistency.
By adhering to ISO 21805:2023/Amd 1:2025, stakeholders significantly improve the reliability and safety of gaseous fire-extinguishing system enclosures, helping to prevent fire damage while preserving structural robustness.
Keywords: ISO 21805 amendment, vents design, structural integrity, gaseous fire-extinguishing systems, fire protection standards, vent installation guidance, fire safety engineering, enclosure pressure relief, ISO fire suppression standards, fire system compliance.
ISO 21805:2023/Amd 1:2025 - Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems — Amendment 1 Released:22. 12. 2025
ISO 21805:2023/Amd 1:2025 - Lignes directrices et recommandations relatives à la conception, à la sélection et à l'installation d'évents pour préserver l'intégrité structurelle des enceintes protégées par des systèmes d'extinction d'incendie à gaz — Amendement 1 Released:23. 01. 2026
REDLINE ISO 21805:2023/Amd 1:2025 - Lignes directrices et recommandations relatives à la conception, à la sélection et à l'installation d'évents pour préserver l'intégrité structurelle des enceintes protégées par des systèmes d'extinction d'incendie à gaz — Amendement 1 Released:23. 01. 2026
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Frequently Asked Questions
ISO 21805:2023/Amd 1:2025 is a standard published by the International Organization for Standardization (ISO). Its full title is "Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems — Amendment 1". This standard covers: Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems — Amendment 1
Guidance and recommendations on design, selection and installation of vents to safeguard the structural integrity of enclosures protected by gaseous fire-extinguishing systems — Amendment 1
ISO 21805:2023/Amd 1:2025 is classified under the following ICS (International Classification for Standards) categories: 13.220.10 - Fire-fighting; 91.140.30 - Ventilation and air-conditioning systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 21805:2023/Amd 1:2025 has the following relationships with other standards: It is inter standard links to ISO 21805:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 21805:2023/Amd 1:2025 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
International
Standard
ISO 21805
First edition
Guidance and recommendations on
2023-02
design, selection and installation
of vents to safeguard the structural
AMENDMENT 1
integrity of enclosures protected by
2025-12
gaseous fire-extinguishing systems
AMENDMENT 1
Lignes directrices et recommandations relatives à la conception,
à la sélection et à l'installation d'évents pour préserver l'intégrité
structurelle des enceintes protégées par des systèmes d'extinction
d'incendie à gaz
AMENDEMENT 1
Reference number
ISO 21805:2023/Amd.1:2025(en) © ISO 2025
ISO 21805:2023/Amd.1:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 21805:2023/Amd.1:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.
...
Norme
internationale
ISO 21805
Première édition
Lignes directrices et
2023-02
recommandations relatives à
la conception, à la sélection et
AMENDEMENT 1
à l'installation d'évents pour
2026-01
préserver l'intégrité structurelle
des enceintes protégées par des
systèmes d'extinction d'incendie à
gaz
AMENDEMENT 1
Guidance and recommendations on design, selection and
installation of vents to safeguard the structural integrity of
enclosures protected by gaseous fire-extinguishing systems
AMENDMENT 1
Numéro de référence
ISO 21805:2023/Amd.1:2026(fr) © ISO 2026
ISO 21805:2023/Amd.1:2026(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii
ISO 21805:2023/Amd.1:2026(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas
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ISO 21805:2023/PRF Amd. 1:20252026(fr)
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ISO/TC 21/SC 8
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Secrétariat : SA
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2026-01
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Lignes directrices et recommandations relatives à la conception, à la
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sélection et à l'installation d'évents pour préserver l'intégrité
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structurelle des enceintes protégées par des systèmes d'extinction
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d'incendie à gaz
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AMENDEMENT 1
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Guidance and recommendations on design, selection and installation of vents to safeguard the structural
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integrity of enclosures protected by gaseous fire-extinguishing systems
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2 © ISO #### – Tous droits réservés
ISO 21805:2023/Amd 1:2026(fr)
Formatted: Font: Bold
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Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvreoeuvre, aucune partie
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de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique
ou mécanique, y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable.
Une autorisation peut être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du
demandeur.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, GenèveGeneva
Tél. Phone: + 41 22 749 01 11
E-mail : copyright@iso.org
Web : www.iso.org
Website: www.iso.org
Publié en Suisse
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ii © ISO #### 2026 – Tous droits réservés
ii
ISO 21805:2023/PRF Amd. 1:20252026(fr)
Avant-propos Formatted: Adjust space between Latin and Asian text,
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comité membre intéressé par une étude a le droit de faire partie du comité technique créé à cet effet. Les
organisations internationales, gouvernementales et non gouvernementales, en liaison avec l’ISOl'ISO
participent également aux travaux. L’ISOL'ISO collabore étroitement avec la Commission électrotechnique
internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour éla
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