ISO 21805:2023/Amd 1:2025

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
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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
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has been established has the right to be represented on that committee. International organizations,
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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.
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