EN ISO 21805:2023/A1:2026
(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 (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 (ISO 21805:2023/Amd 1:2025)
Anleitung für die Konstruktion, Auswahl und Installation von Druckentlastungsöffnungen zur Sicherstellung der strukturellen Integrität von Gehäusen, die durch ortsfeste Gaslöschanlagen geschützt sind - Änderung 1 (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 (ISO 21805:2023/Amd 1:2025)
Navodilo in priporočila za projektiranje, izbiro in vgradnjo prezračevalnih naprav za zagotavljanje strukturne integritete namestitvenih prostorov, zaščitenih s sistemi za gašenje s plinom - Dopolnilo A1 (ISO 21805:2023/Amd 1:2025)
General Information
- Status
- Published
- Publication Date
- 13-Jan-2026
- Technical Committee
- CEN/TC 191 - Fixed firefighting systems
- Drafting Committee
- CEN/TC 191/WG 6 - Gas extinguishing Systems and components
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 14-Jan-2026
- Completion Date
- 14-Jan-2026
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 18-Sep-2024
Overview
EN ISO 21805:2023/A1:2026 is an internationally recognized amendment that provides updated guidance and recommendations regarding the design, selection, and installation of vents to ensure the structural integrity of enclosures protected by gaseous fire-extinguishing systems. The amendment (A1) updates the original 2023 standard and aligns with the latest practices in fire protection engineering and safety management for fixed firefighting systems. Developed by the European Committee for Standardization (CEN) in cooperation with ISO technical committees, this standard supports organizations in complying with safety standards and protecting critical infrastructure.
Key Topics
This amendment focuses on several core areas essential for safeguarding enclosures using gaseous fire-extinguishing systems:
- Design of Vents: Recommendations for configuring vents to withstand pressure changes during gas discharge and maintain structural integrity.
- Selection Criteria: Guidance on choosing suitable venting solutions based on enclosure type, system requirements, and risk assessment.
- Installation Practices: Best practices for installing vents to optimize performance and safety, including considerations for accessibility and maintenance.
- Reference Updates: Alignment with other international standards (ISO 6183:2022 and ISO 14520-1:2023), ensuring consistent and updated technical references.
- Compliance and National Adoption: Clarification on integration into national standards and withdrawal of conflicting standards.
Applications
The practical applications of EN ISO 21805:2023/A1:2026 span a variety of sectors where enclosure integrity and fire suppression are crucial:
- Data Centers: Ensuring server rooms and IT enclosures equipped with gaseous fire-extinguishing systems remain structurally robust when systems activate.
- Industrial Facilities: Protecting critical plant rooms, electrical vaults, control centers, and process enclosures against damage during fire suppression events.
- Telecommunications: Securing infrastructure housing sensitive electronics or communication equipment, reducing downtime and equipment loss.
- Commercial Buildings: Applying best venting practices in spaces fitted with fixed firefighting systems, such as archives, libraries, museums, and hospitals.
- Infrastructure Projects: Integrating compliant venting systems in vaults, tunnels, and transportation control rooms with gas-based fire protection.
By following the recommendations in this amendment, organizations can increase reliability, reduce risks of structural failure, and support regulatory compliance for fire safety.
Related Standards
EN ISO 21805:2023/A1:2026 directly references and harmonizes with several key international standards, ensuring that venting approaches are consistent with best practices across sectors:
- ISO 6183:2022: Covers aspects of fire protection equipment and gaseous fire-extinguishing system requirements.
- ISO 14520-1:2023: Details specific requirements for gaseous fire-extinguishing systems, including installation, inspection, and maintenance.
- EN ISO 21805:2023: The core standard, now amended, focusing on venting guidance for enclosures.
- CEN/TC 191 Standards: Related standards for fixed firefighting infrastructure in Europe.
Organizations aiming for optimal fire safety and compliance should reference these related standards in conjunction with EN ISO 21805:2023/A1:2026.
By implementing the guidance in this amendment, stakeholders ensure safe, effective, and compliant venting solutions for enclosures protected by gaseous fire-extinguishing systems, supporting both operational safety and asset preservation.
Get Certified
Connect with accredited certification bodies for this standard
DIBt (Deutsches Institut für Bautechnik)
German Institute for Building Technology.
DIN CERTCO
DIN Group product certification.
Kiwa BDA Testing
Building and construction product certification.
Sponsored listings
Frequently Asked Questions
EN ISO 21805:2023/A1:2026 is a amendment published by the European Committee for Standardization (CEN). 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 (ISO 21805:2023/Amd 1:2025)". 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 (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 (ISO 21805:2023/Amd 1:2025)
EN ISO 21805:2023/A1:2026 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.
EN ISO 21805:2023/A1:2026 has the following relationships with other standards: It is inter standard links to ISO 21805:2023/Amd 1:2025, EN ISO 21805:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 21805:2023/A1:2026 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)
SLOVENSKI STANDARD
01-marec-2026
Navodilo in priporočila za projektiranje, izbiro in vgradnjo prezračevalnih naprav
za zagotavljanje strukturne integritete namestitvenih prostorov, zaščitenih s
sistemi za gašenje s plinom - Dopolnilo A1 (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 (ISO 21805:2023/Amd 1:2025)
Anleitung für die Konstruktion, Auswahl und Installation von Druckentlastungsöffnungen
zur Sicherstellung der strukturellen Integrität von Gehäusen, die durch ortsfeste
Gaslöschanlagen geschützt sind - Änderung 1 (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 (ISO 21805:2023/Amd
1:2025)
Ta slovenski standard je istoveten z: EN ISO 21805:2023/A1:2026
ICS:
13.220.10 Gašenje požara Fire-fighting
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 21805:2023/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2026
EUROPÄISCHE NORM
ICS 13.220.10; 91.140.30
English Version
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)
Lignes directrices et recommandations relatives à la Anleitung für die Konstruktion, Auswahl und
conception, à la sélection et à l'installation d'évents Installation von Druckentlastungsöffnungen zur
pour préserver l'intégrité structurelle des enceintes Sicherstellung der strukturellen Integrität von
protégées par des systèmes d'extinction d'incendie à Gehäusen, die durch ortsfeste Gaslöschanlagen
gaz - Amendement 1 (ISO 21805:2023/Amd 1:2025) geschützt sind - Änderung 1 (ISO 21805:2023/Amd
1:2025)
This amendment A1 modifies the European Standard EN ISO 21805:2023; it was approved by CEN on 11 October 2025.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21805:2023/A1:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 21805:2023/A1:2026) has been prepared by Technical Committee ISO/TC 21
"Equipment for fire protection and fire fighting" in collaboration with Technical Committee CEN/TC
191 “Fixed firefighting systems” the secretariat of which is held by BSI.
This Amendment to the European Standard EN ISO 21805:2023 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by July 2026, and
conflicting national standards shall be withdrawn at the latest by July 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cy
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...