1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 441 Gas Vents STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
2、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Gas Vents, UL 441 Eleventh Edition, Dated April 8, 2016 Summary of Topics This revision to ANSI/UL 441 includes updates to obsolete code references. The revisions also address other miscellaneous universal upkeep of U
3、L for Standards Safety. These revisions are considered to be non-substantive and not subject to ULs STP process. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of this publication may
4、 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,
5、 the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this
6、 Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs 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 ULs Standards for Safety
7、agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. JULY
8、27, 2016 UL 441 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 27, 2016 UL 441 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 8, 2016 (Title P
9、age Reprinted: July 27, 2016) 1 UL 441 Standard for Gas Vents First Edition September, 1958 Second Edition January, 1969 Third Edition January, 1971 Fourth Edition July, 1973 Fifth Edition July, 1979 Sixth Edition March, 1986 Seventh Edition September, 1991 Eighth Edition October, 1994 Ninth Edition
10、 January, 1996 Tenth Edition March, 2010 Eleventh Edition April 8, 2016 This ANSI/UL Standard for Safety consists of the Eleventh Edition and covers the revisions through July 27, 2016. The most recent designation of UL 441 as a Reaffirmed American National Standard (ANS) occurred on June 12, 2014.
11、ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. The Department of Defense (DoD) has adopted UL 441 on September 16, 1991. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for
12、 revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Stand
13、ard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 441-2006 (R2014)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
14、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 8, 2016 GAS VENTS - UL 441 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 5 3 Units of Measurement .6 4 Undated R
15、eferences 6 5 Glossary .6 CONSTRUCTION 6 Materials .7 7 Assembly 9 8 Caps .11 9 Firestops 11 10 Spacers .11 11 Joints .12 12 Radiation Shields .12 13 Roof Assemblies 13 14 Roof Jacks .13 15 Fittings 13 16 Sizes 13 17 Support Assembly 14 PERFORMANCE 18 General 14 19 Test Installation .15 19.1 General
16、 .15 19.2 Type B vents Form I test structure 26 19.3 Type B vents Form II test structure .26 19.4 Type BW vents Form III test structure .27 19.5 Type B Gas vent roof jacks Forms IV and V test structures 27 19.6 Type BW gas vent roof jacks Form VI test structure 28 20 Temperature Measurement 28 21 Te
17、mperature Test Structures .33 21.1 General .33 21.2 Test type BW gas vent or roof jack test structure Forms III and VI .35 22 Temperature Test Gas-Vent Pipe Surfaces .35 23 Draft Loss and Wind Effects Test .36 24 Vertical Support Test 37 25 Strength Test .37 25.1 General .37 25.2 Impact test 38 25.3
18、 Longitudinal force test 40 26 Wind Load Test 40 27 Rain Test 42 28 Crushing Test of Nonmetallic Flue-Gas Conduit 45 29 Resistance to Action of Acids Test of Nonmetallic Flue-Gas Conduit 46 30 Freezing and Thawing Test of Water-Absorptive Nonmetallic Materials 46 31 Cemented Joint Test of Flue-Gas C
19、onduit .47 APRIL 8, 2016 GAS VENTS - UL 441 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 32 Sulfuric Acid Extraction Test for Porcelain-Coated Steel Used for Flue-Gas Conduit 47 MARKING 33 General 48 INSTRUCTIONS 34 Installation Instruct
20、ions 49 APRIL 8, 2016 GAS VENTS - UL 441 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover Types B and BW gas vents and Types B and BW gas vent roof jacks intended for venting gas appliances e
21、quipped with draft hoods to burn only gas. Type B vents are also intended for use with other Category I appliances that specify they are for use with Type B gas vents. 1.2 The gas vents covered by these requirements are intended for installation in accordance with the National Fire Protection Associ
22、ation Standards for Chimneys, Fireplaces, Vents, and Solid-Fuel Burning Appliances, NFPA 211 the National Fuel Gas Code, NFPA 54, the Department of Housing and Urban Development Mobile Home Construction and Safety Standards, Chapter II of 24 CFR, Part 280, the International Mechanical Code, and the
23、Uniform Mechanical Code. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.2 A component need not comply with a specic requirement that: a) Involves a feature or characteristic not needed in the app
24、lication of the component in the product covered by this standard; or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordance with its recognized rating established for the intended conditions of use. 2.4 Specic components are recognized as being incomplete in
25、 construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions for which they have been recognized. JULY 27, 2016 GAS
26、 VENTS - UL 441 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units of Measurement 3.1 If a value for measurement is followed by a value in other units in parentheses, the second value may be only approximate. The rst stated value is th
27、e requirement. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 For the purpose of this standard, the following denitions apply. 5.2 CAT
28、EGORY I APPLIANCE An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. 5.3 COMBUSTIBLE MATERIAL Material made of or surfaced with wood, compressed paper, plant bers, or other material that ignites
29、and burns, as applied to materials adjacent to or in contact with heat-producing appliances, chimney connectors and vent connectors, steam and hot water pipes, and warm air ducts. Such material shall be identied as combustible even though ameproofed, re- retardant treated, or plastered. 5.4 NONCOMBU
30、STIBLE MATERIAL A material that, in the form in which it is used and under the conditions anticipated, does not ignite, burn, support combustion, or release ammable vapors when subjected to re or heat. 5.5 ROOF JACK A factory-built assembly for conveying ue gases through a roof and that includes a u
31、e gas passageway, an insulating means, ashing, and a cap. 5.6 TYPE B GAS VENT A gas vent for venting gas appliances with draft hoods and other Category I gas appliances listed for use with Type B gas vents. 5.7 TYPE BW GAS VENT A gas vent for venting gas-red vented wall furnaces. APRIL 8, 2016 GAS V
32、ENTS - UL 441 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 6 Materials 6.1 A gas-vent and a roof-jack part shall be made of noncombustible corrosion-resistant materials. Metals shall not be used in combinations that result i
33、n galvanic action at any location within the assembly. 6.2 The minimum thickness of sheet metal, including any coatings, shall be as referenced in Table 6.1 unless otherwise specied. 6.3 Aluminum alloys containing more than 1.0 percent magnesium shall not be used when the reectivity of the material
34、is utilized to reduce the risk of re. 6.4 A ue-gas conveying conduit shall be of a material having durability and resistance to corrosion and heat equivalent to that of Type 1100 aluminum, Series 300 or Types 430 and 446 stainless steel, or porcelain-coated steel complying with the requirements cont
35、ained herein. Except as noted in 6.5, parts in contact with ue gases or ue gas-air mixtures, or subject to condensation, shall be of material having durability and resistance to corrosion and heat equivalent to Type 1100 aluminum or Series 300 or Types 430 and 446 stainless steel. Table 6.1 Minimum
36、metal thickness Inch (mm) Aluminum alloys (1100, 3003) inner pipe 0.012 (0.30) Aluminum alloys (1100, 3003) other than inner pipe 0.016 (0.41) Steel 0.016 (0.41) Galvanized steel (G90 coating class) 0.018 ( 0.46) Aluminum-coated steel (0.40 ounces per square foot) 0.018 (0.46) Stainless steel (Type
37、430) 0.012 (0.30) 6.5 An outer casing or other structural part shall be of stainless steel, galvanized steel, or aluminum-coated steel when: a) Deterioration or corrosion of the part results in the venting system to collapse or otherwise increase the risk of injury to persons; b) The part adjoins re
38、stopping material; or c) The part is subject to condensation. Exception: This requirement does not apply to the ue-gas conveying conduit or other parts in contact with ue-gases or ue-gas air mixtures. See 6.4. APRIL 8, 2016 GAS VENTS - UL 441 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRO
39、DUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.6 Galvanized steel used for outer casings, structural parts, restopping or other components or subassemblies shall have a zinc-coating complying with the coating designation G90 (former coating class 1.25 commercial) in the Weight (Mass) of Coatin
40、g Requirements table in the Standard Specication for Steel Sheet, Zinc Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot Dip Process, ASTM A653/A653M-94, with not less than 40 percent of the zinc on any side, based on the minimum single spot test in the ASTM designation. The we
41、ight of zinc coating shall be established in accordance with the Standard Test Method for Weight Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings, ANSI/ASTM A90. Aluminum-coated steel shall be of Type T1-40 (regular) 0.40 ounce per square foot (0.12 kg/m 2 ). 6.7 A painted
42、 part made of steel not less than 0.053 inch (1.35 mm) thick, or of cast iron not less than 0.125 inch (3.18 mm) thick and for use only in the interior of buildings, has corrosion resistance equivalent to that required by 6.5. Paint coatings shall remain intact at the maximum temperatures obtained o
43、n the part during the tests specied in these requirements. 6.8 Except for binder materials, thermal insulation material shall be noncombustible. 6.9 Thermal insulation shall be in accordance with the following conditions when the gas vent or roof jack is tested in accordance with these requirements:
44、 a) The products resulting from the combustion or volatilization of any combustible binder shall be discharged to the vent terminus outside of the building. b) The insulating material shall remain in its intended position. c) The thermal conductivity of the insulating material shall not be increased
45、. d) Thermal insulation shall not show evidence of softening, melting, or other evidence of malfunction or deterioration. 6.10 Thermal insulation shall not come into contact with products of combustion. 6.11 Thermal insulation that is not self-supporting shall be applied to solid surfaces so that th
46、e insulation does not sag. An adhesive or cement used to attach such material shall retain its adhesive qualities at any temperature that adhesive attains when tested in accordance with these requirements and at 0F (minus 18C). 6.12 A water-absorbing insulating material shall not be subjected to wet
47、ting by condensation or rain when installed as intended. APRIL 8, 2016 GAS VENTS - UL 441 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Assembly 7.1 Each part of a gas vent shall be constructed for ready attachment of one to the other w
48、ithout requiring alteration, cutting, threading, drilling, welding, or similar task by the installer. Exception: A length of gas-vent pipe shall be shortened by cutting when means are provided to permit the shortened length to be coupled to any companion part. 7.2 Two or more parts of a gas vent tha
49、t bear a denite relationship to each other in the intended application shall: a) Be arranged and constructed to permit them to be incorporated into the complete assembly without alteration or alignment and only in the correct relationship with each other; or b) Be assembled and shipped from the factory as one unit. 7.3 Each gas-vent part, such as gas-vent pipe section, an elbow, coupling, or tee, shall be completely assembled by the manufacturer at the
