use of portable fire extinguishers can extinguish many fires while they
are still small. You should be aware, however, that The Marion Fire
Department should be notified (618) 997-5730 without delay as soon as any
fire is discovered.
There are basically four different types
or classes of fire extinguishers, each of which extinguishes specific types
of fire. Newer fire extinguishers use a picture/labeling system to designate
which types of fires they are to be used on. Older fire extinguishers are
labeled with colored geometrical shapes with letter designations. Both of
these types of labels are shown to the left and below with the description
of the different classes of extinguishers.
The best type of extinguisher for home use will be a multi-class extinguisher designated by A-B-C. This extinguisher can be used on most household fires.
|Fire Extinguisher Ratings||Multi-Class Ratings|
|Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper. The numerical rating for this class of fire extinguisher refers to the amount of water the fire extinguisher holds and the amount of fire it will extinguish.|
|Many extinguishers available today can be used on different types of fires and will be labeled with more than one designator, e.g. A-B, B-C, or A-B-C. Make sure that if you have a multi-purpose extinguisher it is properly labeled.|
|Class B Extinguishers should be used on fires involving flammable liquids, such as grease, gasoline, oil, etc. The numerical rating for this class of fire extinguisher states the approximate number of square feet of a flammable liquid fire that a non-expert person can expect to extinguish.||This is the old style of labeling indicating suitability for use on Class A, B, and C fires.|
|Class C Extinguishers are suitable for use on electrically energized fires. This class of fire extinguishers does not have a numerical rating. The presence of the letter “C” indicates that the extinguishing agent is non-conductive.||This is the new style of labeling that shows this extinguisher may be used on Ordinary Combustibles, Flammable Liquids, or Electrical Equipment fires. This is the new labeling style with a diagonal red line drawn through the picture to indicate what type of fire this extinguisher is NOT suitable for. In this example, the fire extinguisher could be used on Ordinary Combustibles and Flammable Liquids fires, but not for Electrical Equipment fires.|
|Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question. There is no picture designator for Class D extinguishers. These extinguishers generally have no rating nor are they given a multi-purpose rating for use on other types of fires.|
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Types of Fire Extinguishers
How to Use a Fire Extinguisher
P A S S -- Pull, Aim, Squeeze, and Sweep
|Dry Chemical extinguishers are usually rated for multiple purpose use. They contain an extinguishing agent and use a compressed, non-flammable gas as a propellant.||
|Pull the pin at the top of the extinguisher that keeps the handle from being accidentally pressed.|
|Halon extinguishers contain a gas that interrupts the chemical reaction that takes place when fuels burn. These types of extinguishers are often used to protect valuable electrical equipment since them leave no residue to clean up. Halon extinguishers have a limited range, usually 4 to 6 feet. The initial application of Halon should be made at the base of the fire, even after the flames have been extinguished.||
|Aim the nozzle toward the base of the fire.|
|Water These extinguishers contain water and compressed gas and should only be used on Class A (ordinary combustibles) fires.||
|Stand approximately 8 feet away from the fire and squeeze the handle to discharge the extinguisher. If you release the handle, the discharge will stop.|
|Carbon Dioxide (CO2) extinguishers are most effective on Class B and C (liquids and electrical) fires. Since the gas disperses quickly, these extinguishers are only effective from 3 to 8 feet. The carbon dioxide is stored as a compressed liquid in the extinguisher; as it expands, it cools the surrounding air. The cooling will often cause ice to form around the “horn” where the gas is expelled from the extinguisher. Since the fire could re-ignite, continue to apply the agent even after the fire appears to be out.||
|Sweep the nozzle back and forth at the base of the fire. After the fire appears to be out, watch it carefully since it may re-ignite!|
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