ICC NAFED Certified Portable Fire Extinguisher Technician (FE)

What is the primary extinguishing mechanism of ABC dry chemical agents such as monoammonium phosphate?

Cooling the fuel surface below ignition temperature Interrupting the chemical chain reaction of combustion Diluting oxygen concentration below 15% Forming a physical barrier over the fuel

Correct Answer:

Interrupting the chemical chain reaction of combustion

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