UL 441-2016 UL Standard for Safety Gas Vents (Eleventh Edition Reprint with revisions through and including July 27 2016).pdf

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 Eleventh Edition of the Standard for Gas Vents, UL 441 is being issued as an Editorial New Edition update only. No changes to the requirem

3、ents have been made. 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 warrant

4、y of any kind, either expressed or implied, including but not limited to, 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

5、 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 ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of

6、 the claim. Users of the electronic versions of ULs Standards for Safety 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 i

7、s storing an electronic Standard on the purchasers computer system. APRIL 8, 2016 UL 441 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 8, 2016 UL 441 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRO

8、DUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 8, 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

9、Edition October, 1994 Ninth Edition January, 1996 Tenth Edition March, 2010 Eleventh Edition April 8, 2016 This ANSI/UL Standard for Safety consists of the Eleventh Edition. The most recent designation of UL 441 as a Reaffirmed American National Standard (ANS) occurred on June 12, 2014. ANSI approva

10、l 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 revisions o

11、n 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 Standard should b

12、e 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 REPRODUCTION OR

13、 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 References 6

14、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 .15 19.2 Ty

15、pe 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 Temperature Te

16、st 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 Longitudina

17、l 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 Conduit .47 A

18、PRIL 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 Instructions 49 APRI

19、L 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 equipped with

20、 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 Gas vents are intended for installation in accordance with the Standards of the National Fire Protection Association for Chimneys, Fireplace

21、s, Vents, and Solid-Fuel Burning Appliances, NFPA 211 and the National Fuel Gas Code, NFPA 54. Gas vents are also intended for installation in accordance with the Department of Housing and Urban Development Mobile Home Construction and Safety Standards, Chapter II of 24 CFR, Part 280 and codes such

22、as the BOCA Basic/National Mechanical Code, the Standard Mechanical Code, and the 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 spec

23、ic requirement that: a) Involves a feature or characteristic not needed in the application 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 inten

24、ded conditions of use. 2.4 Specic components are recognized as being incomplete in 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 un

25、der those specic conditions for which they have been recognized. APRIL 8, 2016 GAS 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

26、 parentheses, the second value may be only approximate. The rst stated value is the 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 Glo

27、ssary 5.1 For the purpose of this standard, the following denitions apply. 5.2 CATEGORY 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

28、 surfaced with wood, compressed paper, plant bers, or other material that ignites 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 com

29、bustible even though ameproofed, re- retardant treated, or plastered. 5.4 NONCOMBUSTIBLE 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

30、factory-built assembly for conveying ue gases through a roof and that includes a ue 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

31、 GAS VENT A gas vent for venting gas-red vented wall furnaces. APRIL 8, 2016 GAS VENTS - 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 cor

32、rosion-resistant materials. Metals shall not be used in combinations that result in 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

33、 than 1.0 percent magnesium shall not be used when the reectivity of the material 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 4

34、46 stainless steel, or porcelain-coated steel complying with the requirements contained 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 11

35、00 aluminum or Series 300 or Types 430 and 446 stainless steel. Table 6.1 Minimum 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) Alumi

36、num-coated steel (0.40 ounces per square foot) 0.018 (0.46) Stainless steel (Type 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 co

37、llapse or otherwise increase the risk of injury to persons; b) The part adjoins restopping 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,

38、 2016 GAS VENTS - UL 441 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION 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 des

39、ignation G90 (former coating class 1.25 commercial) in the Weight (Mass) of Coating 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

40、on any side, based on the minimum single spot test in the ASTM designation. The weight 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 b

41、e of Type T1-40 (regular) 0.40 ounce per square foot (0.12 kg/m 2 ). 6.7 A painted 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

42、 by 6.5. Paint coatings shall remain intact at the maximum temperatures obtained on 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 conditio

43、ns when the gas vent or roof jack is tested in accordance with these requirements: 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 posit

44、ion. c) The thermal conductivity of the insulating material shall not be increased. 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 in

45、sulation that is not self-supporting shall be applied to solid surfaces so that the 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 (mi

46、nus 18C). 6.12 A water-absorbing insulating material shall not be subjected to wetting 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

47、part of a gas vent shall be constructed for ready attachment of one to the other without 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 l

48、ength to be coupled to any companion part. 7.2 Two or more parts of a gas vent that 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

49、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 factory. 7.4 A Type B or BW gas-vent roof jack shall be completely assembled by the manufacturer at the factory and shall include, in addition to the ue gas carrying conduit, an outer jacket or body and insulating mean