ARIhas joined with theCanadian Standards Association's (CSA) to revise ARI Standard 310/380-2004, and CSA Standard C744-04 "Packaged Terminal Air Conditioners and Heat Pumps." The joint standard supersedes the previous edition of the standard, published in 1993, which was based on the requirements of ARI Standard 310-90, "Packaged Terminal Air-Conditioners," and ARI Standard 380-90, "Packaged Terminal Heat Pumps."