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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