1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): LRBAStandard Number: UL 1370Edition Date: July 18, 2011Edition Number: 1Section / Paragraph Reference: 13.1Subject: Hood Assembly required usage for Combusti
3、on TestsDECISION:13.1 The unvented decorative appliance is to be observed for a stable burner flame. Samples of thecombustion products are to be analyzed for maximum smoke density, carbon monoxide, carbon dioxide,nitrogen dioxide, and oxygen concentration in accordance with 13.2 - 13.9. See 10.2 for
4、 details on fluegas analysis. The hood as described in 10.2.3 is not required for the test described in 13.2 - 13.9 (sealedroom), but not shall be required for the test described in 13.10 (open room).RATIONALE FOR DECISION:This Certification Requirement Decision is intended to document the safety re
5、quirements for the hoodassembly, as shown in Figure 10.4, required usage for the Combustion Tests. The current language ofparagraph 13.1 appears to be reversed. To be consistent with other unvented standards, the hood shouldbe used in the open room and not in the closed room. Primarily, the open roo
6、m combustion test is ameasure of the products of combustion. Therefore, using the hood would assist in getting a concentrationof the flue gases into the analyzer while minimizing dilution air. The closed room test is a measure ofoxygen depletion and therefore, using the hood could potentially yield
7、incorrect/non-representative valuesdue to a concentration of the emissions being measured in lieu of an average for the entire room. Thisdecision reflects current engineering practice.Copyright 2012 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does
8、 not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not
9、 represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including cons
10、equential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 1370 -2-No Text on This Page
