Fire extinguishers are classified by letters and numbers according to the class and size fire they can put out. The letter — A, B, C or D — indicates the class of fire. The number is a measure of the capacity of the extinguisher — the larger the number the greater the capacity to put out a fire.
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Although some boat fires involve burning wood and paper (Class A), these fires can be put out with water. Do not use water on gasoline, oil or electrical fires. Water causes gasoline and oil fires to spread, and an electrical current is conducted through the water.
Make sure to inspect your fire extinguishers monthly to make sure they are properly stored, charged and undamaged. Portable extinguishers should be mounted where they are accessible. Check the gauge to make sure the extinguisher is still charged. Check the seals to make sure they have not been tampered with. Replace cracked or broken hoses and keep nozzles free from obstruction. You should also weigh them to assure that they meet the minimum weight stated on the label.
Once you use a fire extinguisher, you should either have it recharged, if it is rechargeable, or replaced, if it is a disposable type. In any event, always make sure that your extinguisher label indicates that it is a U.S. Coast Guard-approved marine type device.
Which extinguisher is best for which type of fire?
| Type of Extinguisher | Class of fire |
| Carbon Dioxide-CO2 | A, B, C |
| Halon(until year 2000) | A, B, C |
| Dry Chemical | B, C |
| Foam | B |
All power boats, except outboards under 26 feet and of open construction, must carry one B-I, U. S. Coast Guard-approved fire extinguisher.
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