Which safety class is associated with mildly flammable refrigerants?

Which safety class is associated with mildly flammable refrigerants?

• A. A1
• B. A2L
• C. A3
• D. B2

Answer: (B)

Mildly flammable refrigerants fall into the A2L safety class. In this labeling system, the letter indicates toxicity (A = lower toxicity, B = higher toxicity) and the number/letter indicates flammability (2 means flammable, with the “L” standing for lower flammability within that 2 category). So A2L specifically designates refrigerants that are of low toxicity but only mildly flammable, not non-flammable or highly flammable. Examples include refrigerants like R-1234yf. By contrast, A1 is non-flammable, A3 is highly flammable, and B2 would involve higher toxicity with flammability, not mild flammability. Hence the option describing the mildly flammable class is the correct one.

Mildly flammable refrigerants fall into the A2L safety class. In this labeling system, the letter indicates toxicity (A = lower toxicity, B = higher toxicity) and the number/letter indicates flammability (2 means flammable, with the “L” standing for lower flammability within that 2 category). So A2L specifically designates refrigerants that are of low toxicity but only mildly flammable, not non-flammable or highly flammable. Examples include refrigerants like R-1234yf.

By contrast, A1 is non-flammable, A3 is highly flammable, and B2 would involve higher toxicity with flammability, not mild flammability. Hence the option describing the mildly flammable class is the correct one.