UL-1978 › Complete Document History
Standard for Grease Ducts

Complete Current Edition:
   4TH EDITION - GREASE DUCTS - Dec. 13, 2010
   CHANGE 09/13 - REVISION CHANGE - CODE B - Sept. 19, 2013
   CHANGE 04/17 - REVISION CHANGE - CODE B - April 28, 2017
   CHANGE 10/21 - REVISION CHANGE - CODE B - Oct. 11, 2021
   CHANGE 04/24 - REVISION CHANGE - CODE B - April 2, 2024

Obsolete Revision Information:
   CHANGE 06/09 - REVISION CHANGE - CODE A - June 3, 2009
   1ST EDITION - GREASE DUCTS - June 25, 2002