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What are the 5 different classes of fire and what type of extinguisher can safely be used on each?

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Class A- Water, Foam, Dry Powder, and CO2 Extinguishers. Class B- Foam, Dry Powder, and CO2 Extinguishers. Class C- Dry Powder, or CO2 Extinguishers. Class D- Dry Powder or CO2 Extinguishers. Class K- CO2 Extinguishers. -There are also special powders for Class D metal fires. -CO2 extinguishers have no "Post Fire Security" and the fire could re-ignite.
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