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 of ANSI/UL 793 is being issued to reect th
3、e latest Reaffirmation of ANSI approval. No changes have been made to the requirements within this Standard. 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
4、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 effective. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, elect
5、ronic, mechanical photocopying, 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
6、liable for any special, incidental, 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
7、 of such damage. In no event shall 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, liabili
8、ty, damage, claim, or judgment (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, table
9、s, 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 date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMEN
10、TS notice. JANUARY 27, 2016 UL 793 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 27, 2016 UL 793 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
11、December 31, 2008 (Title Page Reprinted: January 27, 2016) 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 Standard for Safety consists of the Third Edition including revisi
12、ons through January 27, 2016. The most recent designation of ANSI/UL 793 as an American National Standard (ANSI) occurred on January 27, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisio
13、ns 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 of a Standard shou
14、ld 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 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 793-2011 (R2016)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTIO
15、N OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 27, 2016 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 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.
16、1 Units of measurement .4 2.2 References 4 2.3 Components .4 CONSTRUCTION 3 General 5 4 Materials .5 5 Assembly 5 6 Protection 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
17、13 Dust Loading Exposure Test .8 14 Wind-Uplift Test 9 15 Impact Resistance Test .9 16 Fire Test of Drop-Out Vents .9 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 N
18、OT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover automatically operated roof vents for smoke and heat that fall into two general categories: mechanically-opened and gravity-opened. Mechanically-opened vents consist pr
19、imarily of a body frame, one or more damper covers and hatches, and operating mechanisms which generally include a heat 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 manuall
20、y or automatically in the event of re to remove smoke and heat from the building. Automatic operation does not depend 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 shr
21、inking and falling from place due to re exposure, or the like. These vents are not intended for use as general purpose 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 in
22、formation. 2.2 References 2.2.1 Any undated 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. 2.3 Components 2.3.1 Except as indicated in 2.3.2, a component of a product covered by this sta
23、ndard shall comply with the requirements for that component. 2.3.2 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 requirem
24、ent in this standard. 2.3.3 A component shall be used in accordance with its rating established for the intended conditions 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 condi
25、tions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 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
26、FROM UL CONSTRUCTION 3 General 3.1 A roof vent shall be constructed to open during an internal building re to facilitate 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
27、 Materials 4.1 The nonmetallic materials used in a dome or cover(s) of a vent shall have the following properties: a) 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 ligh
28、t exposure test, the materials shall: 1) Retain their physical properties as outlined in UL 746C (for example, retain 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 bette
29、r, in accordance with the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, 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
30、 shall be constructed so as to open and lock in an open position. 5.3 A mechanically-opened vent shall open outward and the top cover shall not be any closer than 241 mm (9-1/2 in) to the top curb height or 305 mm (12 in) to the bottom of the roof deck when opening or when fully open. 5.3 revised Se
31、ptember 30, 2011 SEPTEMBER 30, 2011 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER 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 Serie
32、s 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 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
33、 Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process, ASTM A653/A653M, with not less than 40 percent 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
34、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 Coating 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
35、 zinc coating, other than that provided on hot-dipped mill galvanized sheet steel, uniformly applied to an average thickness of not less than 0.00041 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 wi
36、th the test method in the Standard Guide for Measurement of Electrodeposited Metallic Coating Thicknesses by the Dropping Test, ASTM B555. An annealed 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 thicknes
37、s of coating is to be established in accordance with the test method in the Guide for Measurement of Electrodeposited Metallic Coating Thicknesses 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 acceptabili
38、ty 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 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 s
39、prings and bearings used in the assembly of vents shall be of material having resistance to atmospheric corrosion. 6.4 A hot-dipped mill galvanized 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 shal
40、l 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 If 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
41、 considered damaged. Simple sheared or cut edges and punched holes are not considered to be formed, but rolled edges shall comply with the requirements in 6.4. DECEMBER 31, 2008 AUTOMATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUC
42、TION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Heat Responsive Devices 7.1 A heat responsive device shall comply with the Standard for Heat Responsive 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 tem
43、perature 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 fusible 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 bu
44、ilding 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 the 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
45、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 shall: 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 protec
46、tive wire mesh screen made of steel wire at least 2.37 mm (0.093 in) thick with maximum openings or a mesh size of 25.4 mm (1 in), placed not less than 102 mm (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 edg
47、es 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 screen. 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.). DECEMBER 31, 2008 AUTOM
48、ATICALLY OPERATED ROOF VENTS FOR SMOKE AND HEAT - UL 793 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 9 Cycling Test 9.1 Representative sample(s) of a mechanically-opened vent shall function as intended after being operated f
49、or 250 full-stroke (that is, locked-open and reclose) operations under static conditions. These operations will be conducted by simulating the vents fusible link or 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 mechanisms in which the fusible link or other
