A. Nitrous Oxide
B. Methane
C. Carbon Dioxide
D. Carbon Dioxide & Nitrous Oxide

Carbon dioxide (CO2) is used in some hand-held extinguishers and in fixed systems to displace oxygen and smother the fire. CO2 is used in some dry chemical (powder) hand-held and wheeled extinguishers as a propellant to expel the agent (dry chemical) which, through a chemical reaction, extinguishes the fire.

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