UL-1812 Complete Document History
Standard for Ducted Heat Recovery Ventilators

Complete Current Edition:
   4TH EDITION - Standard for Ducted Heat Recovery Ventilators - May 3, 2013
   CHANGE 04/14 - REVISION CHANGE - CODE C - April 17, 2014
   CHANGE 06/17 - REVISION CHANGE - CODE C - June 21, 2017
   CHANGE 04/21 - REVISION CHANGE - CODE C - April 13, 2021

Obsolete Revision Information:
   CHANGE 11/12 - REVISION CHANGE - CODE C - Nov. 1, 2012
   CHANGE 06/10 - REVISION CHANGE - CODE C - June 11, 2010
   3RD EDITION - DUCTED HEAT RECOVERY VENTILATORS - Oct. 29, 2009
   CHANGE 03/09 - REVISION CHANGE - CODE D - March 13, 2009
   CHANGE 01/06 - REVISION CHANGE - CODE D - Jan. 26, 2006
   CHANGE 08/04 - REVISION CHANGE - CODE D - Aug. 13, 2004
   2ND EDITION - DUCTED HEAT RECOVERY VENTILATO - April 11, 1995
   1990 EDITION - DUCTED HEAT RECOVERY VENTILATO - Jan. 1, 1990