Which refrigerant is classified as an A3 refrigerant?

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Multiple Choice

Which refrigerant is classified as an A3 refrigerant?

Explanation:
A3 refers to highly flammable refrigerants while toxicity remains relatively lower. R-290 is propane, a hydrocarbon with strong flammability, so it falls into the A3 category. The other refrigerants listed (R-22, R-134a, and R-407C) are nonflammable and sit in the A1 classification, so they are not A3. This distinction matters for handling and safety practices, since A3 refrigerants require stricter precautions to manage ignition risk.

A3 refers to highly flammable refrigerants while toxicity remains relatively lower. R-290 is propane, a hydrocarbon with strong flammability, so it falls into the A3 category. The other refrigerants listed (R-22, R-134a, and R-407C) are nonflammable and sit in the A1 classification, so they are not A3. This distinction matters for handling and safety practices, since A3 refrigerants require stricter precautions to manage ignition risk.

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