1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 793 Automatically Operated Roof Vents for Smoke and Heat STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYR
2、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Automatically Operated Roof Vents for Smoke and Heat, UL 793 Third Edition, Dated December 31, 2008 Summary of Topics This revision was issued to incorporate the following ch
3、anges: Revision to Section 5, Assembly Revision to Section 12, Fire Resistance Test The revised requirements are substantially in accordance with Proposal(s) on this subject dated September 30, 2016. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked w
4、ith a vertical line in the margin. 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 w
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8、le purchaser is storing an electronic Standard on the purchasers computer system. MARCH 3, 2017 UL 793 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 3, 2017 UL 793 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
9、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL December 31, 2008 (Title Page Reprinted: March 3, 2017) 1 UL 793 Standard for Automatically Operated Roof Vents for Smoke and Heat First Edition November, 1995 Second Edition June, 2003 Third Edition December 31, 2008 This ANSI/UL Stan
10、dard for Safety consists of the Third Edition including revisions through March 3, 2017. The most recent designation of ANSI/UL 793 as an American National Standard (ANSI) occurred on March 3, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Any o
11、ther portions of this ANSI/UL standard that were not processed in accordance with ANSI/UL requirements are noted at the beginning of the impacted sections. 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
12、 Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/. 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 Stan
13、dards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 793-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 27, 2016 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - U
14、L 793 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 4 2.1 Units of measurement .4 2.2 References 4 2.3 Components .4 CONSTRUCTION 3 General 5 4 Materials .5 5 Assembly 5 6 Pr
15、otection Against Corrosion .6 7 Heat Responsive Devices 7 8 Covers 7 PERFORMANCE 9 Cycling Test 8 10 Speed of Opening Test .8 11 Wind and Snow Load Test .8 12 Fire Resistance Test 8 13 Dust Loading Exposure Test .8 14 Wind-Uplift Test 9 15 Impact Resistance Test .9 16 Fire Test of Drop-Out Vents .9
16、MARKING 17 General .9 INSTALLATION AND OPERATING INSTRUCTIONS 18 General 10 DECEMBER 31, 2008 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requi
17、rements cover automatically operated roof vents for smoke and heat that fall into two general categories: mechanically-opened and gravity-opened. Mechanically-opened vents consist primarily of a body frame, one or more damper covers and hatches, and operating mechanisms which generally include a hea
18、t responsive device and spring(s). Gravity-opened vents consist primarily of a body frame and nonmetallic drop-out panel. The vents covered by these requirements are operated manually or automatically in the event of re to remove smoke and heat from the building. Automatic operation does not depend
19、on electrical power or other energy sources that may be interrupted during a re, but rather depends upon operation of a heat responsive device or on the action of a plastic cover shrinking and falling from place due to re exposure, or the like. These vents are not intended for use as general purpose
20、 building ventilation devices. 2 General 2.1 Units of measurement 2.1.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.2 References 2.2.1 Any undated reference to a code or standard appearing in the requirements of this stan
21、dard shall be interpreted as referring to the latest edition of that code or standard. 2.3 Components 2.3.1 Except as indicated in 2.3.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.3.2 A component is not required to comply with a specic
22、 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. 2.3.3 A component shall be used in accordance with its rating established for the intended condi
23、tions of use. 2.3.4 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 temperatures not exceeding specied limits, and shall be used only under those specic conditions
24、. DECEMBER 31, 2008 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 3 General 3.1 A roof vent shall be constructed to open during an internal building re to facilita
25、te venting of smoke and heat. 3.2 A vent shall be constructed to operate automatically, independent of electrical power or other energy sources that may be interrupted during a re. 4 Materials 4.1 The nonmetallic materials used in a dome or cover(s) of a vent shall have the following properties: a)
26、They shall comply with the ultraviolet light exposure test in the Standard for Polymeric Materials Use In Electrical Equipment Evaluations, UL 746C, and b) After the ultraviolet light exposure test, the materials shall: 1) Retain their physical properties as outlined in UL 746C (for example, retain
27、their tensile strength and tensile impact, or exural strength and Izod impact, depending on the type of material being tested), and 2) Have a minimum ammability rating of HB or better, in accordance with the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
28、, UL 94. 5 Assembly 5.1 A mechanically-opened vent shall be assembled so that it can be manually operated (opened) from inside or outside the building. 5.2 A mechanically-opened vent shall be constructed so as to open and lock in an open position. 5.3 A mechanically-opened vent shall open outward an
29、d the top cover shall not be any closer than 241 mm (9-1/2 in) from the nished roof surface, or 305 mm (12 in) to the bottom of the roof deck when opening or when fully open. MARCH 3, 2017 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTH
30、ER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Protection Against Corrosion 6.1 A metal part used in the vent shall be one of the 300 Series of stainless steel or shall be provided with one of the following corrosion-protection systems or the equivalent. a) A coating of hot-dipped mill
31、 galvanized sheet steel complying with the coating Designation G60 (G90 for an enclosure that houses live parts) or A60 in Table I of the Specication for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process, ASTM A653/A653M, with not less than 40 perc
32、ent of the zinc on any side, based on the minimum single spot test requirement in the ASTM Designation. The weight of the zinc coating may be determined by any method, but in case of question shall be established in accordance with the test method in the Standard Test Method for Weight (Mass) of Coa
33、ting on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings, ASTM A90. An A60 (alloyed) coating shall also comply with the requirements in 6.4. b) A zinc coating, other than that provided on hot-dipped mill galvanized sheet steel, uniformly applied to an average thickness of not less than 0.000
34、41 in (0.0104 mm) on each surface with a minimum thickness of 0.00034 in (0.00864 mm). The thickness of the coating is to be established in accordance with the test method in the Standard Guide for Measurement of Electrodeposited Metallic Coating Thicknesses by the Dropping Test, ASTM B555. An annea
35、led coating shall also comply with the requirements in 6.4. c) A cadmium coating not less than 0.0127 mm (0.0005 in) thick on both surfaces. The thickness of coating is to be established in accordance with the test method in the Guide for Measurement of Electrodeposited Metallic Coating Thicknesses
36、by the Dropping Test, ASTM B555. d) Two coats of an organic nish of the epoxy or alkyd-resin type or other outdoor paint on each surface. The acceptability of the paint may be determined by its composition or by corrosion tests as specied in the Standard for Organic Coatings for Steel Enclosures for
37、 Outdoor Use Electrical Equipment, UL 1332. 6.2 Coated or uncoated metals used in the assembly of vents shall be galvanically compatible. 6.3 Component springs and bearings used in the assembly of vents shall be of material having resistance to atmospheric corrosion. 6.4 A hot-dipped mill galvanized
38、 A60 (alloyed) coating or an annealed zinc coating that is bent or similarly formed after annealing and that is not otherwise required to be painted shall be painted in the bent or formed area as specied in 6.1 (d) if the bending or forming process damages the zinc coating as described in 6.5. 6.5 I
39、f aking or cracking of the zinc coating at the outside radius of the bent or formed section is visible at 25 power magnication, the zinc coating is to be considered damaged. Simple sheared or cut edges and punched holes are not considered to be formed, but rolled edges shall comply with the requirem
40、ents in 6.4. DECEMBER 31, 2008 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Heat Responsive Devices 7.1 A heat responsive device shall comply with the Standard for Heat Resp
41、onsive Links for Fire-Protection Service, UL 33, and shall be used in a manner such that it is not subjected to loads that exceed its rating. 7.2 The temperature rating of the fusible link or other heat responsive devices shall be a minimum of 71C (160F) and shall not exceed 271C (520F). 7.3 A fusib
42、le link, thermostat, or other heat responsive device shall be located so as to be in a heat exposed position when the vent is subjected to an internal building re. 7.4 When more than one heat responsive device is used to release the vent, the operation of any one heat responsive device shall open th
43、e vent. 7.5 A plastic drop-out cover which serves as a heat responsive device that shrinks and falls from place due to re exposure shall comply with the re test requirements of this standard. See Section 16, Fire Test of Drop Out Vents. 8 Covers 8.1 A vent cover that employs nonmetallic material sha
44、ll: a) Have its cover rise not less than 10 percent of the maximum span, or not less than 127 mm (5 in), whichever is greater; or b) Incorporate a protective wire mesh screen made of steel wire at least 2.37 mm (0.093 in) thick with a maximum mesh opening 25.4 mm (1 in), placed not less than 102 mm
45、(4 in) nor more than 252 mm (10 in) above the entire nonmetallic portion of the cover. The screen shall also be formed around the extreme edges of the nonmetallic portion of the cover. Exception: A vent that complies with the Impact Resistance Test, Section 15, need not incorporate a wire mesh scree
46、n. 8.2 A vent that incorporates a fall out type nonmetallic dome shall have a maximum area of 9.30 m 2 (100 sq. ft.). MARCH 3, 2017 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U
47、L PERFORMANCE 9 Cycling Test 9.1 Representative sample(s) of a mechanically-opened vent shall function as intended after being operated for 250 full-stroke (that is, locked-open and reclose) operations under static conditions. These operations will be conducted by simulating the vents fusible link o
48、r other heat responsive device actuation. 9.2 The vents are to be cycled at an ambient temperature between 10 40C (50 104F) while oriented in the horizontal position. 9.3 If the vents manual operating (opening) device and the related linkage mechanisms are different than the operating linkage mechan
49、isms in which the fusible link or other heat responsive device are located, the sample(s) of the vent which underwent the 250 cycles test is to be subjected to 50 full-stroke operations using the manual operating device. 10 Speed of Opening Test 10.1 The speed of opening of the vent shall not be less than an average of 2.5 s. This average is based on ve consecutive cycles with no one cycle less than 2.0 s. 11 Wind and Snow Load Test 11.1 A vent shall open to the locked-open position when subjected to
