UL 181B Closure Systems for Use With Flexible Air Ducts and Air Connectors tr1 FEBRUARY13,2008-UL181B Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook, IL 60062-2096 UL Standard for Safety for Closure Systems for Use With Flexible Air Ducts and Air Connectors, UL 181B Second Edition, Dated May 20, 2005 Revisions: This Standard contains revisions through and including February 13, 2008. Summary of Topics These revision to ANS/UL 181B include the following changes in requirements: Revise the mesh requirement in the peel adhesion test on stainless steel to comply with the Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants, AsTM C794, Section 17 ReviseASTM D3654reference Text that has been changed in any manner is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The requirements are substantially in accordance with UL's Proposal(s) on this subject dated August 17, 2007. Attention is directed to the note on the title page of this Standard outlining the procedures to be followed to retain the approved text of this ANSI/UL Standard. The UL Foreword is no longer located within the UL Standard. For information concerning the use and application of the requirements contained in this Standard, the current version of the UL Foreword is located on ULStandardslnfoNet at: http://ulstandardsinfonet.ul.com/ulforeword.html The master for this Standard at UL's Northbrook Office is the official document insofar as it relates to a UL service and the compliance of a product with respect to the requirements for that product and service, UL's Standards for Safety are copyrighted by UL. Neither a printed copy of a Standard, nor the distributior diskette for a Standard-on-Diskette and the file for the Standard on the distribution diskette should be altered in any way. All of UL's Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. only if it incorporates the most recently adopted revisions. not limited to, the implied warranties of merchantability or fitness for any purpose.