|Three Classes of Fires The method that is used to put out a fire depends upon the type of fire. Fires have been grouped in four classes.|
Fires in wood, paper, cloth, and similar common materials are called Class A fires. These materials usually form glowing coals, which help to sustain the fire. Such fires can be stopped most readily by cooling with water or watery solutions. Water has the advantage of usually being plentiful and cheap.
Blazes in flammable liquids such as gasoline, oil, or grease are termed Class B fires.. The material and the fire would float and spread if a stream of water were used on the flames. Such blazes are smothered; that is, oxygen from the air is cut off.
fires those in charged electrical equipment should be put out by an agent which does not conduct electricity.
Certain combustible metals, such as magnesium, titanium, potassium and sodium. These metals burn at high temperatures and give off sufficient oxygen to support combustion. They may react violently with water or other chemicals, and must be handled with care.
|How To Use
Remember the PASS-word!
|Keep your back to an unobstructed exit and stand six to eight feet away from the fire. Follow the four-step procedure: Pull, Aim, Squeeze, and Sweep.|
|Pull the Pin: This unlocks the operating lever and allows you to discharge the extinguisher. Some extinguishers may have other lever-release mechanisms.|
|AIM low: Point the extinguisher nozzle ( or hose ) at the base ( bottom ) of the fire|
|SQUEEZE the lever above the handle:This discharges the extinguishing agent. Releasing the lever will stop the discharge. (Some extinguishers have a button instead of a lever)|
|SWEEP from side to side: Moving carefully toward the fire, keep the extinguisher aimed at the base of the fire and sweep back and forth until the flames appear to be out. Watch the fire area. If the fire re-ignites, repeat the process.|
|Always be sure that the fire department is called to check the fire site, even if you think you've extinguished the fire|
National Fire Protection Association