1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2158A Clothes Dryer Transition Duct STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT A
2、UTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Clothes Dryer Transition Duct, UL 2158A First Edition, Dated December 11, 2013 Summary of Topics This revision of ANSI/UL 2158A is being issued to update the title page to reect reaffirmation of
3、ANSI approval. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The requirements are substantially in accordance with Proposal(s) on this subject dated February 24, 2017. All rights reserved. No part of this public
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8、em. APRIL 18, 2017 UL 2158A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 18, 2017 UL 2158A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBE
9、R 11, 2013 (Title Page Reprinted: April 18, 2017) 1 UL 2158A Standard for Clothes Dryer Transition Duct Prior to the rst edition, the requirements for the products covered by this standard were included in the Outline of Investigation for Clothes Dryer Transition Duct, UL 2158A. First Edition Decemb
10、er 11, 2013 This ANSI/UL Standard for Safety consists of the First Edition including revisions through April 18, 2017. The most recent designation of ANSI/UL 2158A as a Reaffirmed American National Standard (ANS) occurred on April 13, 2017. ANSI approval for a standard does not include the Cover Pag
11、e, 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 ULs On-Line Collaborative Standards Development System (CSDS) at https:/. ULs Standards for Safety are cop
12、yrighted 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 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 2158A-
13、2013 (R2017)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 11, 2013 CLOTHES DRYER TRANSITION DUCT - UL 2158A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F
14、ROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Components .4 3 Units of Measurement .4 4 Undated References 5 5 Glossary .5 CONSTRUCTION 6 General 5 7 Corrosion Resistance .6 PERFORMANCE 8 Test Program .6 9 Surface Burning Test 6 10 Flame Resistance Test .7 11 Bending Test .8 12 Corrosion Resistance Test
15、 .8 12.1 General 8 12.2 Test for zinc-coated steel 8 12.3 Tests for coated steel (other than zinc-coated steel) 9 13 Puncture Test 10 14 Impact Test .12 15 Tension Test 15 16 Torsion Test 15 MARKINGS 17 General 16 INSTRUCTIONS 18 Installation Instructions 16 19 User Instructions 17 DECEMBER 11, 2013
16、 CLOTHES DRYER TRANSITION DUCT - UL 2158A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements apply to clothes dryer transition ducts intended for venting household and commercial clothes dryers. 1.2
17、The ducts covered by these requirements are intended to connect a clothes dryer to an existing permanent duct provided as a part of the building structure. The duct is intended to vent lint and humid air from drying clothes. 2 Components 2.1 Except as indicated in 2.2, a component of a product cover
18、ed by this standard shall comply with the requirements for that component. 2.2 A component is not required to comply with the 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
19、 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 or restricted in performance capabilities. Such components are intended for use only under lim
20、ited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3.2 Unless indicated o
21、therwise, all voltage and current values mentioned in this standard are rms. DECEMBER 11, 2013 CLOTHES DRYER TRANSITION DUCT - UL 2158A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code
22、 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 CLOTHES DRYER An appliance used to dry wet laundry by means of heat derived
23、 from the combustion of fuel, electric heating elements, or steam. 5.3 CLOTHES DRYER TRANSITION DUCT A passageway assembled in a factory for conveying the exhaust of a clothes dryer to the venting system installed in the building structure. CONSTRUCTION 6 General 6.1 A transition duct shall be metal
24、. Exception: Nonmetallic materials may be employed if constructed in layers in combination with metal. Layered constructions shall comply with the Surface Burning Test, Section 9. 6.2 Flexible ducts shall be factory-made, either as a continuous piece or as a 2-part sectional assembly. Flexible ducts
25、 shall not exceed 8 ft (2.4 m) in length. 6.3 Sheet metal collars and clamps having a minimum thickness as shown in Table 6.1 may be provided as part of the assembly of the transition clothes dryer ducts. When collars and clamps are included as part of the assembly, the intended nal assembly shall b
26、e evaluated as specied in the individual sections of this standard. Table 6.1 Minimum thickness Galvanized steel Aluminum (minimum thickness, in) (minimum thickness, in) 0.013 0.016 DECEMBER 11, 2013 CLOTHES DRYER TRANSITION DUCT - UL 2158A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODU
27、CTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Corrosion Resistance 7.1 Iron and steel parts other than stainless steel shall be provided with corrosion protection by enamelling, galvanizing, plating, or other equivalent means. Aluminum alloy parts shall be alloy 1100, 3003, or an alloy that has
28、 been found to have equivalent resistance to corrosion. 7.2 The corrosion resistant coating shall be that providing protection against atmospheric corrosion at least equivalent to steel having a uniform coating of zinc of not less than 0.3 ounce per square foot (1 g/mm 2 ) of surface area as determi
29、ned in accordance with 12.2.1. PERFORMANCE 8 Test Program 8.1 Table 8.1 indicates the tests applicable to rigid and exible type duct. Table 8.1 Test program Section Test Type Rigid Flexible 9 Surface Burning Yes Yes 10 Flame Resistance Yes Yes 11 Bending No Yes 12 Corrosion Resistance Yes Yes 13 Pun
30、cture Yes Yes 14 Impact Yes Yes 15 Tension No Yes 16 Torsion No Yes 9 Surface Burning Test 9.1 With reference to the Exception to 6.1, representative samples of duct employing nonmetallic materials layered with metal shall have surface burning characteristics of not over 25 without evidence of conti
31、nued progressive combustion (ame spread). The tests for surface burning characteristics are to be conducted as specied in the Standard for Tests for Surface Burning Characteristics of Building Materials, UL 723. 9.2 Samples are to be positioned in the 25 feet (7.62 m) long re test chamber specied in
32、 the Standard for Tests for Surface Burning Characteristics of Building Materials, UL 723. If the duct is sufficiently rigid, no supplemental supports are to be used. When necessary, due to characteristics of a duct that may affect the conduct of the test, 1/4 inch (6.4 mm) diameter steel rods may b
33、e used to support the duct. If supporting rods are used, they are to be spaced between 2 feet and 4 feet (0.6 m and 1.2 m) apart as required for support of the samples. 9.3 If the inside and outside surfaces of a duct are of different composition, tests for surface burning characteristics are to be
34、conducted by exposing rst one side and then the other to the test conditions, using different samples for each exposure. DECEMBER 11, 2013 CLOTHES DRYER TRANSITION DUCT - UL 2158A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 10 Flame Res
35、istance Test 10.1 Duct samples shall be subjected to the 5-inch (127 mm) ame test described in 10.2 10.4. As a result of the test: a) The duct shall not continue to burn for more than 1 minute after the fth 5-second application of the test ame, b) Flaming drops or aming or glowing particles shall no
36、t be emitted by the test sample at any time during the test that ignite the surgical cotton below the test specimen, and c) The duct shall not exhibit burn-through. Exception: A duct that is constructed of materials that complies with the 5VA test specied in the Standard for Tests for Flammability o
37、f Plastic Materials for Parts in Devices and Appliances, UL 94, need not be subjected to this test. 10.2 A Bunsen or Tirrill burner with a tube length of 3.94 0.39 inches (100 10 mm) and an inside diameter of 0.374 0.012 inch (9.5 0.3 mm), is to be placed remote from the specimen, ignited, and adjus
38、ted so that when the burner is in a vertical position, the overall height of the ame is 5 inches (127 mm), and the height of the inner blue cone is 1.5 inches (38 mm). The tube shall not be equipped with end attachments such as a stabilizer. 10.3 The duct, minimum 12 inches (305 mm) in length, is to
39、 be mounted vertically, in a draft-free test chamber, enclosure, or laboratory hood. A layer of surgical cotton is to be located 12 inches (305 mm) below the point of application of the test ame. The 5-inch (127 mm) ame is to be applied to the inside surface at an angle of approximately 20 degrees,
40、in so far as possible, from the vertical so that the tip of the blue cone touches the duct. The test ame is to be applied to the center of the duct and to any joints or seams on three different samples. A supply of technical-grade methane gas is to be used with a regulator and meter for uniform gas
41、ow. Exception: Natural gas having a heat content of approximately 1000 Btu/ft 3 (37 Mj/m 3 ) at 73F (23C) may be used. 10.4 The ame is to be applied for 5 seconds and removed for 5 seconds. The operation is to be repeated until the sample has been subjected to ve applications of the test ame. DECEMB
42、ER 11, 2013 CLOTHES DRYER TRANSITION DUCT - UL 2158A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 11 Bending Test 11.1 A exible duct shall be bent through a 180-degree arc over a mandrel having a diameter equal to the inside diameter of
43、the duct in accordance with 11.2 11.3. As a result of the test, the sample shall not rupture, break, tear, rip, or separate; any reduction in internal cross-sectional area shall not exceed 20 percent at any time during the test; and there shall be no evidence of other damage to the sample which woul
44、d cause it to be unacceptable for further use. 11.2 Previously untested samples are to be tested. Samples, 8 feet (2.43 m) long, are to be selected. Acceptable steel clamps or collars, if not part of the assembly, are to be attached to each end of the test sample in accordance with the manufacturers
45、 instructions. One end of the test sample is to be retained in place and the sample positioned adjacent to the test mandrel so that the center joint of the sample is not located in the area to be subjected to bending. The sample is to be bent through a 180-degree arc around the test mandrel. 11.3 Th
46、e test is to be repeated ve times, and each time the sample is to be returned to its original position. Observations are to be made during and following the test. 12 Corrosion Resistance Test 12.1 General 12.1.1 A duct which may have the protective coating damaged or the effectiveness reduced by the
47、 manufacturing process is to be tested after being subjected to such process. 12.2 Test for zinc-coated steel 12.2.1 To determine compliance with 7.2, the amount of zinc coating is to be determined in accordance with the Standard Method of Test for Weight of Coating on Zinc-Coated (Galvanized) Iron
48、or Steel Articles, ASTM A90. 12.2.2 If aking or cracking of the zinc coating at the outside radius of a bent or formed section is visible at 25 power magnication, or if the coating is scored, the zinc coating is considered to be damaged and is unacceptable. DECEMBER 11, 2013 CLOTHES DRYER TRANSITION
49、 DUCT - UL 2158A 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 12.3 Tests for coated steel (other than zinc-coated steel) 12.3.1 General 12.3.1.1 The tests in 12.3.2 12.3.3.1 are to be conducted on coated materials other than galvanized steel after the material has been formed for use in the nished product. The tests are to be conducted on samples of the coated material and on zinc-coated steel having the minimum coating of zinc
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