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The Four Classes of Fire--Types of Fires Explained

There are four classes of fires. All fire extinguishers are labeled, using standard symbols, for the classes of fires on which they can be used. A red slash through any of the symbols tells you the extinguisher cannot be used on that class of fire. A missing symbol tells you only that the extinguisher has not been tested for a given class of fire, but may be used if an extinguisher labeled for that class of fire is not available.

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When To Use Portable Fire Extinguishers

Portable extinguishers are not designed to fight large or spreading fires. Even against small fires, they are useful only under certain conditions:

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When should I try to fight a fire?

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