UL 1777-2009 Standard for Safety for Chimney Liners.pdf

UL UL1777 ⑧ Underwriters Laboratories Inc . Standard for Safety Chimney Liners july3,2009-ul1777 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook .IL 60062-2096 UL Standard for Safety for Chimney Liners ,UL 1777 Fourth Edition .Dated November 9 ,2007 Revisions :This Standard contains revisions through and including July 3 ,2009 Summary of Topics These revisions of ANSI /UL1777 include changes to the strength requirements :specifying that Loading Test for Metallic Chimney Liners ,Section 23 ,does not apply to corrugated liners ; reducing loading tests of liners for gas-fueled appliances from 200 to 100 pounds ;and specifying that a liner intended for venting gas-fueled only appliances is not subject to the sweep test .1.5 has also been added to show that cement and refractory liners are to be tested to temperatures suitable for solid-fuels Text that has been changed in any manner is marked with a vertical line in the margin .Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement bees effective . The requirements...