UL-555C › Complete Document History
Standard for Ceiling Dampers

Complete Current Edition:
   4TH EDITION - Standard for Ceiling Dampers - Dec. 16, 2014
   CHANGE 05/17 - REVISION CHANGE - CODE B - May 1, 2017
   CHANGE 01/21 - REVISION CHANGE - CODE B - Jan. 21, 2021

Obsolete Revision Information:
   CHANGE 05/10 - REVISION CHANGE - CODE A - May 4, 2010
   CHANGE 01/10 - REVISION CHANGE - CODE A - Jan. 25, 2010
   CHANGE 03/09 - REVISION CHANGE - CODE A - March 9, 2009
   3RD EDITION - CEILING DAMPERS - Oct. 11, 2006
   2ND EDITION - CEILING DAMPERS - Dec. 20, 1996
   1992 EDITION - CEILING DAMPERS - Jan. 1, 1992