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FACT SHEET: Amendment to HFO-1234yf SNAP Rule for Motor Vehicle Air Conditioning Sector  


Under the Significant New Alternatives Policy (SNAP) Program, EPA is revising a requirement for the use of HFO-1234yf as an acceptable substitute for ozone depleting substances (ODS) in motor vehicle air conditioning (MVAC) systems.  EPA found this alternative acceptable subject to use conditions in March 2011. This direct final rule will update one use condition to refer to the latest version of a standard from the Society of Automotive Engineers (SAE) International.

Additional Background

In March 2011, EPA’s SNAP program issued a final rule allowing the use of the refrigerant HFO-1234yf, subject to certain use conditions to ensure safe use.  Among those use conditions was a requirement for a specific type of connector for use with refrigerant containers of HFO-1234yf, as specified in the standard SAE J2844 (February 2011 edition).  

In October 2011, SAE International updated the SAE J2844 standard to adopt a more robust connector that would be less likely to leak. This action will update the use condition to refer to the new connector in the more recent version of the standard.

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