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Fire Marshal > Fire
Operation of Fire Extinguishers
Extinguishers have a label on the front with operating instructions. The operating
principle is the same for all extinguishers - PASS:
Pull the pin. Extinguishers have a safety mechanism
to prevent the extinguisher from being accidentally discharged. Usually the safety
mechanism involves a pin held in place by a plastic tie. Since the plastic may stretch
before breaking or may be difficult to break, twisting the pin first will break the tie
Aim at the base of the fire at the fuel. Aiming at the
fire does no good, since the fire is only the products of combustion coming off the fuel.
Squeeze the two parts of the handle to operate the
valve and discharge the extinguishing agent.
Sweep the extinguishing agent rapidly back and forth
to cover all of the fuel and separate the fuel from the fire. In the case of flammable
liquid fires, technique is very important. The bigger the fire, the more chance the
fire will flash back because of the heated vapors.