ARI
Air-Conditioning and Refrigeration Institute
www.ari.org
CE
European “Conformité Européenne” Mark
www.cemarking.net
UL
Underwriters Laboratories Inc.
www.ul.com
CSA
Canadian Standards Association
www.csa.ca
ETL – ETL SEMKO Division
ASME
American Society of Mechanical Engineers
www.asme.org