1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1738 Venting Systems for Gas-Burning Appliances, Categories II, III, and IVUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRI
2、GHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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 These revisions to ANSI/UL 1738 are bein
3、g issued to change the implementation of recent the Rain Test proposal. Text that has been changed in any manner or impacted by ULs electronic publishing system 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
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9、n this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective d
10、ate are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. NOVEMBER 7, 2014 UL 1738 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 7, 2014 UL 1738 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NO
11、T AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 4, 2010 (Title Page Reprinted: November 7, 2014) 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 Edi
12、tion October 4, 2010 This ANSI/UL Standard for Safety consists of the Third edition including revisions through November 7, 2014. The most recent designation of ANSI/UL 1738 as an American National Standard (ANSI) occurred on November 7, 2014. ANSI approval for a standard does not include the Cover
13、Page, Transmittal Pages, Title Page, or effective date information. 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 ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs
14、 Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy 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 2014 UNDERWRITERS LAB
15、ORATORIES INC. ANSI/UL 1738-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 4, 2010 UL 1738 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS
16、 INTRODUCTION 1 Scope .5 2 Units of Measurement .5 3 Glossary .5 4 Undated References 7 5 Components 7 CONSTRUCTION 6 Materials .7 7 Assembly 9 8 Joints .10 9 Firestop Spacers .10 10 Thimbles .11 11 Support Assembly 11 12 Radiation Shields .12 13 Vent Termination or Caps 12 14 Drain Fittings .12 15
17、Appliance Adapters .13 PERFORMANCE 16 General 14 17 Test Installations 15 18 Temperature Measurement 23 18.1 Thermocouples 23 18.2 Vent gas temperatures 23 18.3 Other temperatures .24 19 Temperature Test Structure 28 20 Draft Loss, Wind Effects and Induced Updraft Tests 30 20.1 Draft loss test 30 20
18、.2 Wind effects tests 30 20.3 Induced updraft test 31 21 Vertical Support Test 32 22 Strength Tests 32 22.1 Impact test 32 22.2 Longitudinal force test 35 22.3 Load test for vent elbows 36 22.4 Vent joint load test .36 23 Wind Load Test 37 23.1 Test on roof assemblies .37 23.2 Test on lateral suppor
19、ts .40 24 Rain Test 42 25 Freezing and Thawing Test for Water-Absorptive Nonmetallic (Cementitious) Materials .45 26 Cemented Joint Test for Metallic Vent Gas Conduit .46 27 Condensate Exposure Test for Porcelain-Coated Steel Used for Vent Gas Conduit .47 28 Vent Sag Test for Horizontal Installation
20、s 48 29 Puncture Test 49 30 Bending Test .51 OCTOBER 4, 2010 UL 1738 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 31 Torsion Test .52 32 Pressure Test 52 33 Leakage Test 53 34 Joint Sealing Compound Test 54 35 Joint Tightness Test .54 36
21、 Strength Test for Joining Non-Metallic Vent Systems 55 37 Low-Temperature Handling Test (Non-Metallic Venting Systems) .58 38 Water Absorption Test .58 39 Resistance to Condensate-Exposure Corrosion Test for Metals 59 40 Polymeric Materials Conditioning for Physical Properties Tests .59 40.1 Genera
22、l .59 40.2 Elevated temperature conditioning 60 40.3 Light and water conditioning .60 40.4 Condensate conditioning 60 41 High Acid Conditioning Test 61 42 Polymeric Materials Physical Properties Tests 62 42.1 General .62 42.2 Tensile strength 62 42.3 Impact 63 42.4 Pipe deection (crush) resistance a
23、nd stiffness 63 42.5 Flammability .63 43 Deection Temperature of Polymeric Materials Under Load Test .64 44 Internal Stress Test .64 MARKING 45 General 65 46 Permanency of Marking .66 46.1 General .66 46.2 Air oven-aging test .67 46.3 Humidity test .67 46.4 Unusual-condition exposure test .67 46.5 A
24、dhesives - joint sealant applications .67 INSTRUCTIONS 47 Installation and Maintenance Instructions 72 MANUFACTURING AND PRODUCTION TESTS 48 General 75 49 Longitudinal Force and Torque Test .75 50 Internal Stress Test .76 APPENDIX A Standards for ComponentsA1 OCTOBER 4, 2010 UL 1738 4UL COPYRIGHTED
25、MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover venting systems intended for venting Category II, III, or IV gas-burning appliances as dened by the Standard for Gas-Fired Central Furnaces (except Direct-Ven
26、t Central Furnaces), ANSI Z21.47 and the National Fuel Gas Code, NFPA 54. Venting systems covered by these requirements are intended to be used with Category II, III, and IV appliances that have been installed in accordance with NFPA 54, and with codes such as the BOCA National Mechanical Code, the
27、Standard Mechanical Code, the Uniform Mechanical Code, and local codes. 1.2 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of re or of electric shock or injury to
28、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 features, characteristics, components, materials, or systems conict with specic requirements or pro
29、visions 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 implementation of this standard. 2 Units of Measurement 2.1 Values stated without parentheses are the requiremen
30、t. Values in parentheses are explanatory or approximate information. 3 Glossary 3.1 For the purpose of these requirements, the following denitions apply. 3.2 APPLIANCE A gas burning device constructed and installed in accordance with nationally recognized standards, as appropriate. 3.3 APPLIANCE ADA
31、PTER A special gas vent tting which typically joins non-metallic vent systems to the outlet of a fuel gas-burning appliance. 3.4 CATEGORY II APPLIANCE An appliance that operates with a nonpositive vent static pressure and with a ue loss less than 17 percent in accordance with the Standard for Gas-Fi
32、red Central Furnaces (except Direct-Vent Central Furnaces), ANSI Z21.47. 3.5 CATEGORY III APPLIANCE An appliance that operates with a positive vent static pressure and with a ue loss not less than 17 percent in accordance with the Standard for Gas-Fired Central Furnaces (except Direct-Vent Central F
33、urnaces), ANSI Z21.47. 3.6 CATEGORY IV APPLIANCE An appliance that operates with a positive vent static pressure and with a ue loss less than 17 percent in accordance with the Standard for Gas-Fired Central Furnaces (except Direct-Vent Central Furnaces), ANSI Z21.47. 3.7 COMBUSTIBLE MATERIAL Materia
34、l made of or surfaced with wood, compressed paper, plant bers, or other material that will ignite and burn, 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
35、considered as combustible even though ameproofed, re- retardant treated, or plastered. OCTOBER 4, 2010 UL 1738 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.8 CONDENSING TYPE APPLIANCE Any Category II or IV appliance. 3.9 FLEXIBLE VENTI
36、NG SYSTEM A venting system that is intended to be bent during the installation process to avoid obstacles or to change direction, and whose bending capability is inherent in the vent gas conduit. 3.10 NONCOMBUSTIBLE MATERIAL For the purpose of this Standard, a material which is not capable of being
37、ignited and burned, such as materials consisting entirely of, or a combination of, steel, iron, brick, tile, concrete, slate, asbestos, glass, and plaster. 3.11 OFFSET VENT A venting system that incorporates elbows. 3.12 PRODUCT The term product as used in these requirements refers to all venting sy
38、stems or any part thereof covered by these requirements unless specically noted otherwise. 3.13 RADIATION SHIELD A panel or panels interposed between heating surfaces and jackets to reduce heat loss through radiation. 3.14 TEMPERATURE RATING The maximum use temperature specied by the vent manufactur
39、er for which the venting system is intended. The marked temperature rating is equal to the minimum vent input temperature selected from Table 19.1 less 70 F (38.8 C). 3.15 THIMBLE The part of a venting system that is intended to provide a means for routing the venting system through a combustible wa
40、ll in a horizontal installation. 3.16 VENT GAS CONDUIT The part of a venting system that is directly exposed to vent gas products. 3.17 VENT GAS INPUT TEMPERATURE The vent gas temperature at the location where the venting system attaches to an appliance. 3.18 VENT TERMINATION OR CAP The tting at the
41、 end of the vent pipe that directs the ue products into the outdoor atmosphere. 3.19 VENTING SYSTEM The gas vent, chimney or single-wall metal pipe, and vent connector when used, assembled to form a continuous open passageway from the ue collar or draft hood outlet of a gas appliance to the outside
42、atmosphere for the purpose of removing vent gases. OCTOBER 4, 2010 UL 1738 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard s
43、hall be interpreted as referring to the latest edition of that code or standard. 5 Components 5.1 Except as indicated in 5.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components used in th
44、e products covered by this standard. 5.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 5.3
45、A component shall be used in accordance with its rating established for the intended conditions of use. 5.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain tempera
46、tures not exceeding specied limits, and shall be used only under those specic conditions. CONSTRUCTION 6 Materials 6.1 A venting system shall be made of corrosion resistant materials, or have a corrosion resistant nish in areas subject to corrosion from the effects of condensate, and shall be made o
47、f materials acceptable for exposure to the temperatures anticipated during all operations of the appliance. Metals shall not be used in combinations such as to cause galvanic action at any location within the assembly. 6.2 The thickness of sheet metal, including any coatings, shall not be less than
48、as specied in Table 6.1 unless otherwise specied in these requirements. The requirements in Table 6.1 do not preclude the use of other materials that provide for equivalent rigidity, corrosion resistance, thermal properties, and gas tightness. OCTOBER 4, 2010 UL 1738 7UL COPYRIGHTED MATERIAL NOT AUT
49、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Table 6.1 Minimum metal thickness Metal Inch (mm) Aluminum alloys (1100, 3003) inner pipe 0.012 (0.30) Aluminum alloys (1100, 3003) other than for inner pipe 0.012 (0.30) Steel coated 0.016 (0.41) Galvanized steel (G90 coating class) 0.018 (0.46) Aluminum-coated steel 40 ounces per square foot (0.12 kg/m 2 ) 0.018 (0.46) Stainless steel 0.012 (0.30) 6.3 A vent gas conduit of a ventin
