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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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