FIREEXTINGHUISHERS

Fire Safety: Fire Extinguishers

To understand how fire extinguishers work, you need to understand a little about fire. Fire is a very rapid chemical reaction between oxygen and a combustible material, which results in the release of heat, light,

flames, and smoke.

The Fire Triangle and Fire Classifications:

For fire to exist, the following four elements must be present at the same time:

-Oxygen to sustain combustion

-Heat to raise the material to its ignition temperature

-Some sort of fuel or combustible material

-The chemical reaction that is fire

Fires are then placed into four classifications so we know what fire extinguisher to use:

Identify The Proper Fire Extinguisher

All ratings are shown on the extinguisher faceplate. Some extinguishers are marked with multiple ratings such as AB, BC and ABC. These extinguishers are capable of putting out more than one class of fire.

Class A and B extinguishers carry a numerical rating that indicates how large a fire an experienced person can safely put out with that extinguisher.

Class C extinguishers have only a letter rating to indicate that the extinguishing agent will not conduct electrical current. Class C extinguishers must also carry a Class A or B rating.

Class D extinguishers carry only a letter rating indicating their effectiveness on certain amounts of specific metals.

How A Fire Extinguisher Works

Portable fire extinguishers apply an extinguishing

agent that will either cool burning fuel, displace or

remove oxygen, or stop the chemical reaction so a

fire cannot continue to burn. When the handle of an

extinguisher is compressed, it opens an inner canister

of high-pressure gas that forces the extinguishing

agent from the main cylinder through a siphon tube

and out the nozzle.

Appearances Of Fire Extinguishers with Fire Classifications Labeling

Using Your Fire Extinguisher (P.A.S.S.)

Step 1:

Keep your back toward an unobstructed exit and stand 6 to 8 feet away from the fire.

Step 2:

Remember the PASS word before using

Pull the pin. This unlocks the operating ever and allows you to discharge the extinguisher. Some extinguishers may have a different release device.

Aim low: Point the extinguisher at the base of the fire with the nozzle or hose.

Squeeze the lever above the handle: This will discharge the extinguisher's contents. To stop the discharge, release the lever. Some extinguishers may have a button instead of a lever.

Sweep from side to side: Aim and keep the extinguisher at the base of the fire and sweep back and forth until the flames appear to be out. While doing this, move carefully toward the fire.

Repeat the process if the fire reignites.

Maintenance

Install your fire extinguishers in plain view. Keep them out of reach of children and away from stoves and heating appliances.

Read the operator's manual to learn how to inspect and maintain your fire extinguisher. Extinguishers require routine care.

Rechargeable extinguishers must be serviced after every use. There is a list of service companies in the phone book that provides these services. Disposable fire extinguishers can only be used once. Replace disposable extinguishers after use.

If you are unsure on how to propely install or maintain your fire extinguisher you can call the Mukwonago Fire Department and we will be happy to assist.