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Hi Kisco, The RF28K9070SG, which is a new model, and all other Samsung Refrigerators currently produced for the U.S. market use only R134A refrigerant. The original 4-Door Flex model, RF32FMQDBSR, did use an alternate refrigerant for a short time, but switched to R134A in June 2014 to enable the compressor to be serviced more easily if necessary. Thanks for your interest, Ms. Samsung
Sorry, there was a problem. Please try again later.It's 134a. It's a standard is the law
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