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37、s “CSA Group”American National Standards Institute, Inc.Approved on January 3, 2017 by ANSIVentless firebox enclosures for gas- fired unvented decorative room heatersANSI Z21.91-2017ANSI Z21.91-2017Ventless firebox enclosures for gas-fired unvented decorative room heatersFebruary 2017 2017 CSA Group
38、 1ContentsZ21/83 Technical Committ ee on Standards for Performance and Insta llation of Gas Burning Appliances and Relate d Accessories 2Z21 Technical Subcommitt ee on Standards for Unvent ed Gas-Fired Heating Appliances 5Preface 81 Scope 102 Reference publications 103 Definitions 114 Cons truction
39、154.1 General construc tion and assembly 154.2 Mat erials 164.3 Electrical equipment and wiring 174.4 Wiring methods 244.5 Motor s and blower s 244.6 Ins tructions 254.7 Markings 275 Performance 295.1 General 295.2 Tes t burner 295.3 Tes t burner adjus tment 305.4 Wall, floor , and ceiling tempe rat
40、ures 315.5 Surface tem peratures 345.6 Temperature at discharge air opening 375.7 Marking mater ial adhesion and legibility 386 Manufacturing and pr oduction t ests 39Annex A (informative) Pertinent references to ANSI Y14.15 41Annex B (informative) Wire color designations 42Annex C (informative) Rec
41、ommended wire color usage 43Annex D (informative) Preferred graphic s ymbols of commonly used it ems, extract ed fr om the Standard for Graphic Symbols for Electrical and Electronics Diagrams, ANSI/ IEEE 315 and abbreviations for these it ems 44Annex E (informative) Table of conver sion factor s 46A
42、nnex F (informative) Legibility and design of safety information in ventless firebox enclosure markings and manuals 48ANSI Z21.91-2017Ventless firebox enclosures for gas-fired unvented decorative room heatersFebruary 2017 2017 CSA Group 2Z21/83 Technical Committee on Standards for Performance and In
43、stallation of Gas Burning Appliances and Related AccessoriesB.J. Swiecicki National Pr opane Gas Association, Frankfort, Illinois, USA Cat egory: Gas SupplierChairM.W. Wilber Crane Engineering, Plymouth, Minnesota, USA Cat egory: General Int erestVice ChairM. Ali Association of Home Appliance Manufa
44、cturer s (AHAM), Washington, Distr ict of Columbia, USA Alt ernateJ. Brania Underwrit er s Laboratories Inc., Melville, New York, USA Cat egory: Research/Testi ngJ.H. Cut ts Home Depot U.S.A. Division of Home Depot Inc, Atlanta, Georgia, USA Cat egory: General Int erestM. Deegan Clearwat er Gas Syst
45、 em, Clearwat er , Florida, USA Cat egory: Regulator y/Government AgencyM. Diesch Lennox Int ernational Inc, Carr ollton, Texas, USA Cat egory: ManufacturerJ.M. Emmel Virginia Tech, Blacksburg, Virginia, USA Cat egory: Consumer/User Inte restG.A. Gress Int ernational Code Council (ICC), Country Club
46、 Hills, Illinois, USA Cat egory: Regulator y/Government AgencyANSI Z21.91-2017Ventless firebox enclosures for gas-fired unvented decorative room heatersFebruary 2017 2017 CSA Group 3C. Grider Int ert ek Testi ng Services NA Inc ETL SEMKO, Cortland, New York, USA Alt ernateT.F. Hardin Underwrit er s
47、Laboratories Inc., Research Triangle Pk, North Car olina, USA Alt ernateD.W. Hubbard Int ert ek Commercial suggestio ns for its improvement will be referred to the appropriate committ ee. To submit a proposal for change, please send the following information to inquiriescsagroup.org and include “Pro
48、posal for change” in the subject line: a) Standard designation (number);b) relevant clause, table, and/or figure number;c) wording of the proposed change; andd) rationale for the change.6) To submit a request for interpretation of this Standard, please send the following information to inquiriescsag
49、roup.org and include “Request for interp retation” in the subject line: a) define the problem, making reference to the specific clause, and, where appropriate, include an illustra tive sketch;b) provide an ex planation of circums tances surrounding the actual field condition; andc) where possible, phrase the reques t in such a way that a specific “yes” or “no” answer will address the issue.Committ ee interp retations are processed in accordance with the CSA Directives and guidelines governing Standardization and are available on the Current Standards Acti
