News provided by UL's Randy Haseman, Principal Engineer - Refrigeration and Room Air Conditioning
In December 2017 the U.S. Environmental Protection Agency published a Direct Final Rule that modified the use conditions required for the use of flammable refrigerants in household refrigerators. This rule referenced the 2nd edition of UL 60335-2-24, which allows up to 150 g of an A3 refrigerant.
More recently, on February 28, 2018, the EPA withdrew this direct final rule because they received adverse comments. They will address these comments in the coming months with the goal of publishing a new final rule. There will not be a second comment period on this subject. It is noted that UL will continue to evaluate and Certify household refrigerators employing a flammable refrigerant in the interim period.