UL UL1784 ⑧ Underwriters Laboratories Inc . Standard for Safety Air Leakage Tests of Door Assemblies july102009-ul1784 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook ,IL 60062-2096 UL Standard for Safety for Air Leakage Tests of Door Assemblies ,1784 Third Edition ,Dated February 20 ,2001 Revisions :This Standard contains revisions through and including July 10 ,2009 Summary of Topics This revision to the Standard for Safety for Air Leakage Tests Door Assemblies ,UL 1784 ,is being issued to reflect the latest reaffirmation of ANSI approval .No changes have been made to the requirements within this Standard . UL Standards for Safety are developed and maintained in the Standard Generalized Markup Language ( SGML).SGML - an international standard ( ISO8879-1986 )--is a descriptive markup language that describes a document's structure and purpose ,rather than its physical appearance on a page .Due to formatting differences resulting from the use of UL's new electronic publishing system ,please note that additional pages ( onwhich no requirements have been changed )may be included in revision pages due to relocation of existing text and reformatting o...