Which extinguisher is used for Class B or C by diluting air?

Which extinguisher is used for Class B or C by diluting air?

• A. Water
• B. Carbon Dioxide
• C. Dry Chemical
• D. Halon

Answer: (B)

The key idea is how the extinguisher works to stop a fire. A carbon dioxide extinguisher puts a dense gas over the flames, displacing the surrounding air and reducing the amount of oxygen available for the fire. This smothers the flame without relying on cooling or leaving a residue, which is why it’s well-suited for fires involving flammable liquids (Class B) and energized electrical equipment (Class C). Because there’s little or no residue, it’s safer for electrical gear and helps prevent further damage. However, because it can rapidly lower the oxygen level in a room, using it in occupied or poorly ventilated spaces can be hazardous to people. It isn’t ideal for ordinary combustibles or metal fires where cooling or different extinguishing methods are needed.

The key idea is how the extinguisher works to stop a fire. A carbon dioxide extinguisher puts a dense gas over the flames, displacing the surrounding air and reducing the amount of oxygen available for the fire. This smothers the flame without relying on cooling or leaving a residue, which is why it’s well-suited for fires involving flammable liquids (Class B) and energized electrical equipment (Class C). Because there’s little or no residue, it’s safer for electrical gear and helps prevent further damage. However, because it can rapidly lower the oxygen level in a room, using it in occupied or poorly ventilated spaces can be hazardous to people. It isn’t ideal for ordinary combustibles or metal fires where cooling or different extinguishing methods are needed.