Foam AFFF extinguishers are rated for which fire classes?

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Multiple Choice

Foam AFFF extinguishers are rated for which fire classes?

Explanation:
Foam AFFF extinguishers are designed to fight Class A ordinary combustibles and Class B flammable liquids. The foam blankets burning liquids and, with its film-forming action, helps prevent reignition by separating the fuel from the air, while the water content cools solid fuels. They aren’t suitable for Class C fires involving energized electrical equipment because water-based foams can conduct electricity and pose a shock hazard; electrical fires are typically fought with dry chemical or CO2 extinguishers. So, these extinguishers are rated for Class A and Class B only, not Class C.

Foam AFFF extinguishers are designed to fight Class A ordinary combustibles and Class B flammable liquids. The foam blankets burning liquids and, with its film-forming action, helps prevent reignition by separating the fuel from the air, while the water content cools solid fuels. They aren’t suitable for Class C fires involving energized electrical equipment because water-based foams can conduct electricity and pose a shock hazard; electrical fires are typically fought with dry chemical or CO2 extinguishers. So, these extinguishers are rated for Class A and Class B only, not Class C.

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