UL-998 Complete Document History
Humidifiers

Complete Current Edition:
   6TH EDITION - HUMIDIFIERS - April 9, 2020
   CHANGE 07/22 - REVISION CHANGE - CODE B - July 5, 2022

Obsolete Revision Information:
   CHANGE 04/16 - REVISION CHANGE - CODE B - April 4, 2016
   CHANGE 05/11 - REVISION CHANGE - CODE B - May 19, 2011
   5TH EDITION - HUMIDIFIERS - April 25, 2011
   CHANGE 05/06 - REVISION CHANGE - CODE A - May 12, 2006
   CHANGE 06/03 - REVISION CHANGE - CODE A - June 23, 2003
   4TH EDITION - HUMIDIFIERS - Nov. 7, 2001
   3RD EDITION - HUMIDIFIERS - Jan. 1, 1993
   1987 EDITION - HUMIDIFIERS - Jan. 1, 1987