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UL 1738_2021-03.pdf
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UL 1738
STANDARD FOR SAFETY
Venting Systems for Gas-Burning
Appliances, Categories II, III, and IV
MARCH 25, 2021 - UL1738 tr1
UL Standard for Safety for Venting Systems for Gas-Burning Appliances, Categories II, III, and IV, UL
1738
Third Edition, Dated October 4, 2010
Summary of Topics
This revision of ANSI/UL 1738 dated March 25, 2021 includes temperature ratings and diameters of
vents; 3.14 and Table 19.1
Text that has been changed in any manner or impacted by UL's electronic publishing system is marked
with a vertical line in the margin.
The revised requirements are substantially in accordance with Proposal(s) on this subject dated February
5, 2021.
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.
UL provides this Standard "as is" without warranty of any kind, either expressed or implied, including but
not limited to, the implied warranties of merchantability or fitness for any purpose.
In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,
including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or the
inability to use this Standard, even if UL or an authorized UL representative has been advised of the
possibility of such damage. In no event shall UL's liability for any damage ever exceed the price paid for
this Standard, regardless of the form of the claim.
Users of the electronic versions of UL's Standards for Safety agree to defend, indemnify, and hold UL
harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable
attorney's fees) resulting from any error or deviation introduced while purchaser is storing an electronic
Standard on the purchaser's computer system.
tr2 MARCH 25, 2021 - UL1738
No Text on This Page
OCTOBER 4, 2010
(Title Page Reprinted: March 25, 2021)
ANSI/UL 1738-2021i
1
UL 1738
Standard for Venting Systems for Gas-Burning Appliances, Categories II, III,
and IV
First Edition – November, 1990
Second Edition – December, 1993
Third Edition
October 4, 2010
This ANSI/UL Standard for Safety consists of the Third edition including revisions
through
iMarch 25, 2021.
The most recent designation of ANSI/UL 1738
i as an American National Standard
(ANSI) occurred on
iMarch 25, 2021. ANSI approval for a standard does not
include the Cover Page, Transmittal Pages, and Title Page.
Comments or proposals for revisions on any part of the Standard may be
submitted to UL at any time. Proposals should be submitted via a Proposal
Request in UL's On-Line Collaborative Standards Development System (CSDS)
at https://csds.ul.com.
UL's Standards for Safety are copyrighted by UL. Neither a printed nor electronic
copy of a Standard 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.
COPYRIGHT ©© 2021I UNDERWRITERS LABORATORIES INC.
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