Fire extinguishers are fairly simple devices. Most use compressed air or nitrogen to expel their particular fire suppression agent. There are a few exceptions, Carbon Dioxide (CO2) and halon extinguishers use compressed gasses as their fire suppression agent so don't need another gas to propel the agent. Some dry chemical extinguishers known as stored pressure extinguishers use a cartridge to pressurize the extinguishers at the time of use instead of being under constant pressure.  An older type of extinguisher is the Soda, acid extinguisher, these used a chemical mixture to create pressure forcing out the water carried in the body of the extinguisher. These extinguishers are identified by their brass bodies and are turned on their top to mix the chemicals when they are used. Most fire apparatus carry one or more extinguishers for small fires or in case the vehicle itself has a fire.

There are four classes of fire extinguisher

A) Normal combustibles (paper, wood etc). The most common class A extinguisher is the pressurized water can but there are many multi-purpose dry chemical  extinguishers which work on these fires too. Some fire departments use a hand pumped water can for small fires.

B) Flammable liquids. Dry chemical extinguishers are the most common type of extinguisher for these fires (they use a material similar to baking soda), but CO2, Halon and Pressurized water cans with a foam additive may also be used.

C) Energized electrical. Extinguishers for electrical fires use non conductive medium (they don't conduct electricity) for suppression agents. Dry chemical, halon and CO2 extinguishers are used for these fires.

D) Flammable metal. There are some metals that will burn intensely under the right conditions. Extinguishers for these fires resemble dry chemical extinguishers but use a different chemical which is often specific to the type of metal. These extinguishers are known as Dry Powder to distinguish them from the more common dry chemical extinguishers and the extinguishers are often not red to help identify them.


extinggroup.jpg (96875 bytes) Pressurized water can 5 lb Dry Chem 10lb Dry chem 20lb Dry chem
Fire extinguishers 2 1/2 gallon pressurized water extinguisher 5 lb Dry chemical extinguisher 10 lb Dry chemical extinguisher  20 lb Dry chemical extinguisher
exting5.jpg (31035 bytes) Dry chem extinguisher CO2 extinguisher exting8.jpg (49591 bytes) exting10.jpg (70918 bytes)
40 lb Dry chemical extinguisher Stored pressure dry chemical extinguisher Carbon dioxide extinguisher Carbon dioxide extinguisher Halon extinguisher
exting9.jpg (46792 bytes) pumpcan.jpg (58067 bytes) exting11.jpg (36033 bytes) exting12.jpg (32836 bytes) gauge and handle
Dry powder extinguisher Pump can Soda Acid Extinguisher Soda Acid Extinguisher Handle, gauge and pin assembly
extingdet2.jpg (74184 bytes) Extinguisher mount extmount2.jpg (57843 bytes) extingmount3.jpg (55783 bytes) extingmount4.jpg (61121 bytes)
Handle, gauge and pin assembly Extinguisher mount Extinguisher mount Extinguisher mount Extinguisher mount
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Extinguisher mount Extinguisher mount Extinguisher mount    



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