Don't believe the hype! As the R410A phase-out approaches, much discussion exists around the A2L "mildly flammable" classification of R32 and R454B.
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The A2L designation in ASHRAE 34 is relatively new. The A2L subgroup, as categorized by ASHRAE Standard 34, are a class of refrigerants that have lower toxicity and flammability (flame propagation speed is less than 10 cm/s) compared to other classifications — A = non-toxic, 2 = flammable, L = low burning velocity — making it the second-safest refrigerant category.
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