BS IS0 21925-1:2018 Bsl Standards Publication Fire resistance tests - Fire dampers for air distribution systems Part 1: Mechanical dampers bsi. BSIS021925-1:2018 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS0 21925-1:2018 It supersedesBSIS010294-3:1999,BSIS010294-1:1996+A1:2014, BS IS0 10294-2:1999 and BS IS0 10294-4:2001+A1:2014, which are withdrawn. The UK participation in its preparation was entrusted to Technical CommitteeFSH/22/-/4, Fireresistancetestsfordampers,seals and smoke extraction. Alistoforganizationsrepresented onthis committee can be obtainedon requestto its secretary. This publication does not purport to include all the necessary provisions of a contract.Users are responsible for its correct application. @ The British Standards Institution 2018 PublishedbyBSI Standards Limited 2018 ISBN9780580965562 ICS13.220.50 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2018. Amendments/corrigendaissued sincepublication Date Text affected BS IS0 21925-1:2018 ISO INTERNATIONAL STANDARD 21925-1 First edition 2018-11-26 Fire resistance tests Fire dampers for air distribution systems - Part 1: Mechanical dampers Reference number ISO 21925-1:2018(E) ISO @IS0 2018