ANSI/ASHRAE/IES Standard 34-2019 
Designation and Safety Classification of Refrigerants

(Supersedes ANSI/ASHRAE Standard 34-2016)

The 2019 edition incorporates the 24 approved and published addenda to Standard 34-2016. Among key changes in the 2019 edition are the following:

  • Addition of fifteen total new refrigerants
  • Revisions to make 2L a separate flammability classification of refrigerants
  • Changes that base toxicity classification on the nominal formulation of the blend
  • Corrections to language for the proper naming of molecules containing iodine
  • Revisions to address fluids whose critical temperature is lower than 130°F (54.4°C)
  • Standardization of terminology

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