1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 641 Type L Low-Temperature Venting SystemsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
2、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Type L Low-Temperature Venting Systems, UL 641 Eighth Edition, Dated September 21, 2010 Summary of Topics This revision of ANSI/UL 641 is being issued to update the title page to reect reaffirmation of ANSI a
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9、te following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JUNE 12, 2013 UL 641 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O
10、R DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 12, 2013 UL 641 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 13, 2010 (Title Page Reprinted: June 12, 2013) 1 UL 641 Standard for Type L Low-Temperature Venti
11、ng Systems First Edition May, 1965 Second Edition December, 1970 Third Edition May, 1975 Fourth Edition November, 1976 Fifth Edition March, 1986 Sixth Edition April, 1994 Seventh Edition December, 1995 Eighth Edition December 13, 2010 This ANSI/UL Standard for Safety consists of the Eighth edition i
12、ncluding revisions through June 12, 2013. The most recent designation of ANSI/UL 641 as a Reaffirmed American National Standard (ANS) occurred on June 12, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or pro
13、posals 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 ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy
14、of a Standard 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 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 641-2009 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
15、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 13, 2010 TYPE L LOW-TEMPERATURE VENTING SYSTEMS - UL 641 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 Compone
16、nts 5 3 Units of Measurement .6 4 Glossary .6 CONSTRUCTION 5 Materials .6 6 Assembly 8 7 Caps 9 8 Firestop-Spacers 9 9 Fittings 9 10 Joints .9 11 Radiation Shields .10 12 Roof Assemblies 10 13 Roof Jacks .10 14 Sizes 11 15 Support Assembly 11 PERFORMANCE 16 General 11 17 Test Installation .12 17.1 G
17、eneral .12 17.2 Test structure 18 18 Temperature Measurement 18 19 Temperature Test 570F (299C) Flue Gases 22 20 Temperature Test 1700F (927C) Flue Gases .24 21 Draft Loss Test .24 22 Support Test .25 23 Strength Test .25 23.1 General .25 23.2 Impact test 25 23.3 Longitudinal force test 27 24 Wind L
18、oad Test 27 25 Rain Test 28 26 Crushing Test of Nonmetallic Flue-Gas Conduit 31 27 Resistance to Action of Acids Test of Nonmetallic Flue-Gas Conduit 32 28 Freezing and Thawing Test of Water-Absorptive Nonmetallic Materials 32 29 Cemented Joint Test of Flue-Gas Conduit .33 30 Sulfuric Acid Extractio
19、n Test for Porcelain-Coated Steel Used for Flue-Gas Conduit 33 MARKINGS 31 Marking 34 DECEMBER 13, 2010 TYPE L LOW-TEMPERATURE VENTING SYSTEMS - UL 641 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INSTRUCTIONS 32 Installation Instruction
20、s 35 DECEMBER 13, 2010 TYPE L LOW-TEMPERATURE VENTING SYSTEMS - UL 641 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover factory-built vent piping and ttings constructed to provide venting sys
21、tems for use with gas and liquid fuel-burning appliances that exhaust low-temperature ue gases and that are approved for use with Type L venting systems. 1.2 Requirements for the installation and use of Type L low-temperature venting systems are included in the Standard for Chimneys, Fireplaces, Ven
22、ts, and Solid-Fuel Burning Appliances, NFPA 211, and codes such as the BOCA Basic/National Mechanical Code, the Standard Mechanical Code, and the Uniform Mechanical Code. 1.3 A product that contains features, characteristics, components, materials, or systems new or different from those covered by t
23、he requirements in this standard, and that involves a risk of re or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose
24、features, characteristics, components, materials, or systems conict with specic requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementatio
25、n of this standard. 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 is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in
26、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 rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features o
27、r 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. DECEMBER 13, 2010 TYPE L LOW-TEMPERATURE VENTING SYSTEMS - UL 641 5UL COPYRIG
28、HTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Glossary 4.1 For the purpose of this standard, the fo
29、llowing denitions apply. 4.2 COMBUSTIBLE MATERIAL Material made of or 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 wa
30、ter pipes, and warm air ducts. Such material shall be identied as combustible even though ameproofed, re- retardant treated, or plastered. 4.3 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
31、release ammable vapors when subjected to re or heat. 4.4 TYPE L VENTING SYSTEM A passageway, vertical or nearly so, used for conveying ue gases from oil and gas appliances or their vent connectors to the outside atmosphere. CONSTRUCTION 5 Materials 5.1 A venting system part shall be made of noncombu
32、stible corrosion-resistant materials. Metals shall not be used in combinations at any location within the assembly that causes detrimental galvanic action. 5.2 The minimum thickness of sheet metal, including any coatings, shall be as specied in Table 5.1. Table 5.1 Minimum metal thickness Metal Inch
33、 (mm) Aluminum alloys (1100, 3003) 0.016 (0.41) Steel (uncoated or painted) 0.042 (1.07) Galvanized steel (G-90 coating class) 0.018 (0.46) Aluminum-coated steel Type T1-40 (regular) 0.40 ounce per square foot (0.12 kg/m 2 ) 0.018 (0.46) Stainless steel 0.012 (0.30) 5.3 Aluminum alloys containing mo
34、re than 1.0 percent magnesium shall not be used when the reectivity of the material is employed to reduce the risk of re. 5.4 A ue-gas conveying conduit shall be of cast refractory or clay tile minimum thickness 0.400 inch (10.2 mm), porcelain-coated steel-base metal minimum thickness 0.026 inch (0.
35、66 mm), or Series 300 or Types 430 and 446 stainless steels minimum thickness 0.012 inch (0.30 mm). Cast refractory, clay tile, and porcelain-coated steel shall comply with the requirements specied in Section 26, Crushing Test of Nonmetallic Flue-Gas Conduit; Section 27, Resistance to Action of Acid
36、s Test of Nonmetallic Flue-Gas Conduit; Section 28, Freezing and Thawing Test of Water-Absorptive Nonmetallic Materials; and Section DECEMBER 13, 2010 TYPE L LOW-TEMPERATURE VENTING SYSTEMS - UL 641 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F
37、ROM UL 29, Cemented Joint Test of Flue-Gas Conduit. Flue-gas conveying conduit of porcelain-coated steel shall also comply with the requirements specied in Section 30, Sulfuric Acid Extraction Test for Porcelain-Coated Steel Used for Flue-Gas Conduit. 5.5 Other parts subject to contact by ue-gases o
38、r ue-gas air mixtures at locations beyond the terminus of the ue-gas-conveying conduit, or subject to condensation, shall be of stainless steel Series 300 or Types 430 and 446 or the equivalent. 5.6 An outer casing or other structural part: a) Whose deterioration or corrosion causes the venting syst
39、em to collapse or otherwise increase the risk of injury to persons; b) That adjoins restopping material; or c) Is subject to condensation; shall be of stainless steel, galvanized steel, or aluminum-coated steel. Galvanized steel or aluminum-coated steel shall comply with the requirements of 5.7. Sta
40、inless steel shall comply with 5.2. Exception No. 1: This requirement does not apply to the ue-gas conveying conduit. See 5.4. Exception No. 2: This requirement does not apply to parts subject to contact by ue-gases or ue-gas air mixtures at or beyond the terminus of the ue-gas conveying conduit. Se
41、e 5.5. 5.7 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 Weight (Mass) of Coating Requirements table in of the Specication for S
42、teel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process, ASTM A653, with not less than 40 percent of the zinc 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 th
43、e 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 ). 5.8 A painted part made of steel not less than 0.053 inch (1.35 mm) thick, o
44、r of cast iron not less than 0.125 inch (3.18 mm) thick, and for use only in the interior of buildings, is determined to have corrosion resistance equivalent to that required by 5.6. Paint coatings shall remain intact at the maximum temperatures obtained on the part during the tests specied in these
45、 requirements. 5.9 Except for binder materials, thermal insulation material shall be noncombustible. 5.10 Thermal insulation as employed shall be in accordance with the following conditions when the system is tested in accordance with these requirements: a) The products resulting from the combustion
46、 or volatilization of any combustible binder shall be discharged to the chimney 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; or d) The thermal insulation shall not sh
47、ow evidence of softening, melting, or other evidence of malfunction or deterioration. DECEMBER 13, 2010 TYPE L LOW-TEMPERATURE VENTING SYSTEMS - UL 641 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.11 Thermal insulation shall not come i
48、nto contact with products of combustion. 5.12 Thermal insulation 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 the adhesive attains when tes
49、ted in accordance with these requirements and at 0F (minus 18C). 5.13 A water-absorbing insulating material shall not be subject to wetting by condensation or rain when installed as intended. 6 Assembly 6.1 A venting system shall consist of all the essential parts required for the intended installation of a complete system for venting. Each part of the assembly shall be constructed for ready attachment of one to the other without requiring alteration by the inst
