ISO INTERNATIONAL 17420-1 STANDARD First edition 2021-01 Respiratory protective devices - Performance requirements - Part 1: General Appareils de protection respiratoire - Exigences de performances - Partie1:Généralités Referencenumber ISO17420-1:2021(E) ISO @ IS0 2021 IS017420-1:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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 0111 Email:[email protected] Website:www.iso.org Published in Switzerland ii IS02021-Allrightsreserved IS017420-1:2021(E) Contents Page Foreword iv Introduction. .V 1 Scope. .1 2 Normativereferences. .1 3 Terms, definitions and abbreviations 2 .2 3.1 Terms and definitions 3.2 Abbreviatedterms 2 4 Classification overview 2 2 4.1 General. 5 Generalrequirements for RPD .3 5.1 General 3 5.2 Field of vision. 4 5.3 Resistancetoflame-Singleburnerdynamic 5.4 Compatibilitywith additional equipment 5 5.5 Monitor performance 5 5.6 Warning and checking device(s) 5 5.6.1 Performanceofwarning device(s) 5 5.6.2 Performance of checking device(s) 5 5.7 Protection class determination. 6 5.7.1 General. 6 5.7.2 Total inward leakage (TIL) 6 5.8 Validation by practical performance. 8 8 5.8.1 General. 5.8.2 Donning/doffing. 9 5.8.3 Communication performance-hearing and speech 9 5.8.4 Eye irritation causedbytheRPD 9 5.8.5 Fogging of visor .9 .9 5.8.6 Ergonomicrequirements. 5.9 Requirementsforelements/components 10 5.9.1 RI. 10 6 Testing. .11 6.1 General. 11 6.2 Inspection 11 6.3 Testing of leak tightness of RI class a using negative pressure .11 Bibliography .12 @IS0 2021- All rights reserved ii