For years, HVACR technicians have been used to primarily working with nonflammable (A1) refrigerants, such as R-410A, R-22, and R-404A. Now that HCFCs are being phased out and there is growing concern over the high GWP of some HFCs, new lower-GWP alternatives have been developed to take their place. However, some of these new refrigerants, such as R-32 and R-454B, are mildly flammable (A2L), which means additional safety precautions must be followed when handling them.
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