Fire extinguishers are categorized based on the type of fire they are designed to combat. Here are the main types of fire extinguishers, each marked with a letter classification:
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Class A: For ordinary combustible materials such as wood, paper, cloth, and some plastics. These extinguishers usually contain water or foam.
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Class B: For flammable liquids such as gasoline, oil, paint, and grease. These extinguishers typically use foam, CO2, or dry chemical agents.
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Class C: For electrical fires involving electrical equipment like motors, transformers, and appliances. These extinguishers often contain dry chemicals or CO2.
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Class D: For combustible metals such as magnesium, titanium, and sodium. These extinguishers use dry powder agents specifically designed for metal fires.
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Class K: For cooking oils and fats, typically found in commercial kitchens. These extinguishers usually contain a wet chemical agent.
Additional Types:
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Water-Based Extinguishers: For Class A fires, typically using water or water mist to cool the fire.
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Foam Extinguishers: Effective on both Class A and B fires, they work by creating a barrier between the fuel and the fire.
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Carbon Dioxide (CO2) Extinguishers: Effective for Class B and Class C fires, they work by displacing oxygen and cooling the fuel.
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Dry Chemical Extinguishers: The most common type, effective on Class A, B, and C fires; they work by interrupting the chemical reaction of the fire.
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Wet Chemical Extinguishers: Primarily for Class K fires, they can also be effective on Class A fires related to cooking.
Choosing the Right Extinguisher:
When selecting a fire extinguisher, it is crucial to consider the specific types of fires that may occur in your environment. Always check local regulations and guidelines for the appropriate types of extinguishers needed for your premises.