1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1978 Grease DuctsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
2、DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Grease Ducts, UL 1978 Fourth Edition, Dated December 13, 2010 Summary of Topics These revisions to ANSI/UL 1978 are being issued to incorporate additional requirements for grease duct slopes. Text that has been changed in any manner
3、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 effective date note indicating the date of publication or the date on which the changed requirement becomes effec
4、tive. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated March 22, 2013. 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
5、, 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, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incide
6、ntal, 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 Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event s
7、hall 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 agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment
8、 (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other element
9、s 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 date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. The following table
10、 lists the future effective dates with the corresponding reference. SEPTEMBER 19, 2013 UL 1978 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Future Effective Date Reference September 19, 2014 Paragraph(s) 23.3 SEPTEMBER 19, 2013 UL 1978
11、 tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 13, 2010 (Title Page Reprinted: September 19, 2013) 1 UL 1978 Standard for Grease Ducts First Edition March, 1995 Second Edition June, 2002 Third Edition January, 2005 Fourth Editi
12、on December 13, 2010 This ANSI/UL Standard for Safety consists of the Fourth Edition including revisions through September 19, 2013. The most recent designation of ANSI/UL 1978 as an American National Standard (ANSI) occurred on September 19, 2013. ANSI approval for a standard does not include the C
13、over 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:/
14、. ULs 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 2013 UNDERWRITER
15、S LABORATORIES INC. ANSI/UL 1978-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 13, 2010 GREASE DUCTS - UL 1978 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI
16、SSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 5 3 Units of Measurement .6 4 Undated References 6 5 Terminology 6 6 Glossary 6 CONSTRUCTION 7 Materials .7 8 Assembly 8 9 Joints 9 10 Support Assembly .9 PERFORMANCE 11 General 10 12 Test Installations 11 13 Temperature Measurement 16 14 T
17、emperature Test 500F (260C) Flue Gases 19 15 Abnormal Temperature Test .20 16 Leakage Test 20 17 Vertical Support Test 22 18 Strength Tests 22 18.1 General .22 18.2 Impact test 22 18.3 Longitudinal force test 24 18.4 Load test for grease duct elbows .24 18.5 Grease duct joint load test .25 18.6 Grea
18、se duct joint torsion test 26 19 Fire And Leakage Test Of Grease Duct Access Doors and Fittings .26 20 Pressure Tests For Fittings Exposed To Fire Extinguishing System Pressure 27 21 Tensile Strength, Elongation, And Change In Volume Tests Of Gaskets And Seals 28 21.1 General .28 21.2 Tensile streng
19、th and ultimate elongation tests .28 21.3 Volume change test 29 MARKINGS 22 General 29 INSTRUCTIONS 23 Installation Instructions 30 DECEMBER 13, 2010 GREASE DUCTS - UL 1978 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX A Standard
20、s for ComponentsA1 DECEMBER 13, 2010 GREASE DUCTS - UL 1978 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover factory-built grease ducts, and grease duct assemblies that are intended to be ins
21、talled at reduced clearances where 18 inch (457 mm) clearance is specied in the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, NFPA 96, and the International Mechanical Code. 1.2 These requirements also cover modular grease duct assemblies, unwelded connection
22、s between adjoining duct parts, ttings, access doors, and the like intended for use with grease ducts installed in accordance with NFPA 96 and the International Mechanical Code. 1.3 These requirements do not address NFPA 96 and the International Mechanical Code requirements for grease duct enclosure
23、s. Grease ducts covered only by these requirements are intended to be installed in a re resistive enclosure when required by NFPA 96 or the IMC. 1.4 Requirements used to evaluate the effectiveness of the combination of a grease duct and an enclosure as a re rated enclosure system and through penetra
24、tion restop system, as well as the enclosures effect on the grease duct are contained in Standard for Tests of Fire Resistive Grease Duct Enclosure Assemblies, UL 2221, and ASTM E 2336, Standard Test Methods for Fire Resistive Grease Duct Enclosure Systems. 2 Components 2.1 Except as indicated in 2.
25、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 the products covered by this standard. 2.2 A component is not required to comply with a specic requirement that: a) Involves
26、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. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic componen
27、ts are 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 under those specic conditions. DECEMBER 13, 2010 GREASE DUCTS -
28、UL 1978 5UL COPYRIGHTED 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 Undated References 4.1 Any undated
29、 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 Terminology 5.1 The term grease duct as used in these requirements refers to all grease ducts and grease duct assemblies and any part th
30、ereof covered by these requirements unless specically noted otherwise. 6 Glossary 6.1 For the purpose of these requirements, the following denitions apply. 6.2 ACCESS DOOR A door or cover plate that when opened provides a means for cleaning the grease duct. 6.3 CAPPED TEES A part of a grease duct sh
31、aped like a T that supports, connects, or both, the duct to the hood or vertical section. An access door or cap is provided to facilitate cleaning. 6.4 COMBUSTIBLE MATERIAL Material made of or surfaced with wood, compressed paper, plain bers, or other material that will ignite and burn, as applied t
32、o materials adjacent to or in contact with heat-producing appliances, grease duct and vent connectors, steam and hot water pipes, and warm air ducts. Such material shall be considered as combustible even though ameproofed, re-retardant treated, or plastered. 6.5 FITTINGS Components of the grease duc
33、t system such as tees, elbows, and wyes. 6.6 GREASE TRAP A cup-like or U-shaped part provided on a grease duct that is intended to accumulate grease for removal by personnel. 6.7 NONCOMBUSTIBLE MATERIAL A material that, in the form in which it is used and under the conditions anticipated, will not i
34、gnite, burn, support combustion, or release ammable vapors when subjected to re or heat. Materials that are reported as passing ASTM E136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750C are considered noncombustible materials. 6.8 THIMBLE The part of a grease duct
35、that is intended to provide a means for routing the grease duct assembly through a combustible wall. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 7 Materials 7.1 A grease duct part sh
36、all be made of noncombustible corrosion-resistant materials. Metals shall not be used in combinations at any location within the assembly that are capable of causing galvanic action. 7.2 The minimum thickness of sheet metal, including any coatings, and of other materials shall comply with Table 7.1.
37、 Table 7.1 Minimum thickness of sheet metal Minimum thickness of sheet metal inches (mm) Aluminum alloys (1100, 3003) 0.018 (0.46) Steel 0.0598 (1.52) Galvanized steel (G90 coating class) 0.018 (0.46) Aluminum-coated steel 0.40 ounce per square foot (0.12 kg/m 2 ) 0.018 (0.46) Stainless steel 0.012
38、(0.30) Porcelain-coated steel-base metal 0.026 (1.35) 7.3 Parts of a grease duct or conduit subject to contact by grease-laden vapors shall be of stainless steel or porcelain-coated steel of the minimum thickness specied in Table 7.1. 7.4 An outer casing or other structural part shall be of stainles
39、s steel, galvanized steel, or aluminum-coated steel when: a) Deterioration or corrosion would cause the grease duct system to collapse or otherwise increase the risk of injury to persons; or b) It is subject to condensation. 7.5 Components of a grease duct, or subassemblies, shall be of materials an
40、d thicknesses as specied in Table 7.1. 7.6 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, is corrosion resistant provided that coatings remain intact at the maximum temper
41、atures obtained on the part during the tests specied in these requirements. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.7 Thermal insulation material shall be noncombustible. 7.8 Thermal insula
42、tion shall not come into contact with the grease-laden vapors. 7.9 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 adhe
43、sive may attain when tested in accordance with these requirements and at 0F (minus 18C). 7.10 A water-absorbing insulating material shall not be subject to wetting by condensation or rain when installed as intended. 7.11 Asbestos material shall not be used. 8 Assembly 8.1 A grease duct shall consist
44、 of all the essential parts necessary for the intended installation of a complete grease duct assembly. Each part of the assembly shall be constructed for ready attachment of one to the other without requiring alteration by the installer, such as by cutting, threading, drilling, or similar tasks. Ex
45、ception: An assembly or component part intended to be cut to length or to be tted by the installer may be provided if means are furnished for joining any altered part to a companion part or assembly. All fasteners required to complete the assembly shall be provided with the product by the manufactur
46、er. Drilling is acceptable if: a) The drilling operation does not weaken the assembly or penetrate into the inner casing of the grease duct; and b) The size of the required drill bit is specied and the instructions clearly describe the locations to be drilled, such as by the use of drawings, descrip
47、tions, templates, or the like. Field welding of grease duct parts such as for connection to the exhaust hood is permitted. 8.2 Two or more parts or subassemblies that bear a denite relationship to each other in the intended application shall: a) Be arranged and constructed so that they are capable o
48、f being incorporated in to the complete assembly without need for alteration or alignment and only in the correct relationship with each other; or b) Be assembled and shipped from the factory as one unit. 8.3 Each part, such as a grease duct section or length, tee, or support component, shall be com
49、pletely assembled by the manufacturer at the factory. 8.4 To comply with the requirements of 8.3, a grease duct section comprised of the inner casing of the grease duct, formed insulation or other intermediate assembly, and an outer jacket, all of which may be separable, shall be preassembled and packaged as one unit. In such cases, each separable part shall be completely formed, including the joining of all seams. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 8UL COPYRIGHTED MATERIA
