UNEP and ASHRAE updated list of new refrigerant designations 2025

Date: 2025/05/21
Subject: <a href="/en/news/sectoral_intelligence?news_search_form%5Bsubject_ids%5D%5B%5D=428#results">Regulation
Themes: HFCs ; HFO et HCFO ; <a href="/en/search/Refrigerants,%20secondary%20refrigerants:%20regulations%20and%20standards">Refrigerants, secondary refrigerants: regulations and standards
Keywords: HFC ; HFO ; Standard ; Safety

In May 2025, UNEP and ASHRAE published a fact sheet to provide an update on ASHRAE Standard 34, available in English, French and Spanish.

ASHRAE Standard 34 “Designation and Safety Classification of Refrigerants”, is a useful tool to refer to common refrigerants using simplified nomenclature, instead of chemical formulas. Refrigerants are numbered with an R-, followed by the number assigned by ASHRAE.

In May 2025, the UN Environment Programme (UNEP) and ASHRAE published a fact sheet providing the list of the newly approved refrigerant numbers from the latest edition of Standard 34 and addenda. The fact sheet also presents the current edition of Standard 34 and Standard 15 (Safety Standard for Refrigeration Systems).

This fact sheet is available in English, French and Spanish.

Download the factsheet on FRIDOC

For more information, please visit the UNEP website.