UL 555-2006 Fire Dampers 防火阀标准.pdf

UL555 isbn0-7629-1165-4 Fire Dampers COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL reproduction networking permitted from IHS UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL reproduction or networking permitted from IHS july12,2006-u555 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook ,IL 60062-2096 UL Standard for Safety for Fire Dampers ,UL 555 Seventh Edition ,Dated July 12 ,2006 Summary of Topics The Seventh Edition of the Standard for Fire Dampers ,UL 555 has been issued to reflect the latest ANSI approval date and to incorporate the proposals dated February 17 ,2006 and June 2 , 2006 .These proposals included the following : The revision of allowable clearance between parts during and after a fire test . The revision to delete the " Ambient'rating from 14.1.3. The deletion of paragraph 1 .13 which addresses issues specific to the certification of a product . Revisions to update references throughout the standard . Editorial revisions throughout standard . The revised requirements are substantially in accordance with UL's Propo...