Cold and Hard Facts Refrigerants Q & A- Jan 19, 2023

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Q: Does UL 60335-2-40 allow the use of flammable (A2L, A2, and A3) refrigerants? 

A: Yes, the second edition, (2017) of UL 60335-2-40 allowed flammable (A2 and A3) refrigerants. The third edition (2019) provided additional details regarding flammable refrigerants and carved out A2L as a separate refrigerant class. 

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