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Types of Fire Extinguishers |
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.
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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.
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Water These extinguishers contain water and compressed gas and should
only be used on Class A (ordinary combustibles) fires.
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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. |
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