ISO INTERNATIONAL STANDARD 12759-3 First edition 2019-03 Fans Efficiency classification for fans — Part 3: Fans without drives at maximum operating speed Ventilateurs Classification du rendement des ventilateurs - Partie 3: Ventilateurs non entraineés a vitesse maximale de fonctionnement Reference number IS0 12759-3:2019(E) ISO @ IS0 2019 IS0 12759-3:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 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: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 12759-3:2019(E) Contents Page Foreword ..iv Introduction. 1 Scope.. 2 Normative references 3 Terms and definitions 4 Symbols and units ..2 5 General information .2 5.1 General. .2 5.2 Use of test configurations 3 5.3 Tolerances. .4 Efficiency grade evaluation .4 Annex A (informative) Energy efficiency grades for fans without drives 6 IS0 2019 - All rights reserved iii