EN IS0 21805 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM March 2023 ICS 13.220.10; 91.140.30 Supersedes CEN IS0/TS 21805:2019 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 (IS0 21805:2023) Lignes directrices et recommandations relatives a la Anleitung fur die Konstruktion, Auswahl und conception,alasélectionetal'installationd'évents Installation von Entluftungen zur Gewahrleistung der pour préserver I'integrité structurelle des enceintes strukturellen Integritat von Gehausen, die durch protegées par des systemes d'extinction d'incendie a ortsfeste Gasloschanlagen geschitzt sind (ISo gaz (IS0 21805:2023) 21805:2023) This European Standard was approved by CEN on 7 August 2022. CENmembersareboundtocomplywiththeCEN/CENELECInternal Regulationswhichstipulatetheconditionsforgivingthis European Standard the status of a national standardwithout any alteration.Up-to-datelists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by 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, Turkiye and United Kingdom. ce EUROPEAN COMMITTEE FOR STANDARDIZATION COMITEEUROPEENDENORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels @2023CEN All rights of exploitation in any form and by any means reserved Ref. No. EN IS0 21805:2023 E worldwide for CEN national Members. EN IS0 21805:2023 (E) Contents Page European foreword.. 2 EN IS0 21805:2023 (E) European foreword This document (EN IS0 21805:2023) has been prepared by Technical Committee IS0/TC 21 "Equipment for fire protection and fire fighting" in collaboration with Technical Committee CEN/TC This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2023, and conflicting national standards shall be withdrawn at the latest by September 2023. 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. This document supersedes CEN IS0/TS 21805:2019 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, 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, Turkiye and the United Kingdom. Endorsement notice The text of IS0 21805:2023 has been approved by CEN as EN IS0 21805:2023 without any modification 3