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Benson Systems

2065 W Obispo Ave

Gilbert, AZ 85233

480-719-8545

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www.bensonsys.com

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FIRE EXTINGUISHERS


With so many fire extinguishers to choose from, selecting the proper one for your business can be really confusing.  There are also building codes to consider and other regulations regarding fire extinguishers and fire extinguisher services. It's important to ensure you have the proper type of fire extinguishers and to assist you, here are the most common types of fire extinguishers used.


Fire extinguishers are divided into four categories, and have different fire retardant capabilities based on different types of fires. Each fire extinguisher also has a numerical rating that serves as a guide for the amount of fire the extinguisher can handle.


The higher the number, the more fire-fighting power the fire extinguishers will have in their ability to fight a fire. The following is a quick guide to help choose the right type of  fire extinguisher.


Class A fire extinguishers are for ordinary combustible materials such as paper, wood, cardboard, and most plastics. The numerical rating on these types of extinguishers indicates the amount of water it holds and the amount of fire it can extinguish.

Class B fire extinguishers are for fires involving flammable or combustible liquids such as gasoline, kerosene, grease and oil. The numerical rating for class B fire extinguishers indicates the approximate number of square feet of fire it can extinguish.

Class C fire extinguishers are for fires involving electrical equipment, such as appliances, wiring, circuit breakers and outlets. Never use water to extinguish class C fires - the risk of electrical shock is far too great! Class C extinguishers do not have a numerical rating. The C classification means the extinguishing agent is non-conductive.

Class D fire extinguishers are commonly found in a chemical laboratory. They are for fires that involve combustible metals, such as magnesium, titanium, potassium and sodium. These types of extinguishers also have no numerical rating, nor are they given a multi-purpose rating - they are designed for class D fires only.


FIRE EXTINGUISHER SERVICE


Of course all fire extinguishers need to be serviced on a regular basis. Most fire extinguishers should be serviced on an annual basis.


TYPES OF FIRE EXTINGUISHERS


Here are the most common types of fire extinguishers:


Water extinguishers or APW extinguishers (air-pressurized water) are suitable for class A fires only. Water based extinguishers should never be used on grease fire or electrical fires or class D fires - the flames will spread and make the fire bigger! Water extinguishers are filled with water and are typically pressurized with air. Again - water extinguishers can be very dangerous in the wrong type of situation. Only fight the fire if you're certain it contains ordinary combustible materials only.


Dry chemical extinguishers come in a variety of types and are suitable for a combination of class A, B and C fires. These are filled with foam or powder and pressurized with nitrogen.

BC - This is the regular type of dry chemical extinguisher. It is filled with sodium bicarbonate or potassium bicarbonate. The BC variety leaves a mildly corrosive residue which must be cleaned immediately to prevent any damage to materials.


ABC - This is the multipurpose dry chemical extinguisher. The ABC type is filled with monoammonium phosphate, a yellow powder that leaves a sticky residue that may be damaging to electrical appliances such as a computer

Dry chemical extinguishers have an advantage over CO2 extinguishers since they leave a non-flammable substance on the extinguished material, reducing the likelihood of re-ignition.


Carbon Dioxide (CO2) extinguishers are used for class B and C fires. CO2 extinguishers contain carbon dioxide, a non-flammable gas, and are highly pressurized. The pressure is so great that it is not uncommon for bits of dry ice to shoot out the nozzle. They don't work very well on class A fires because they may not be able to displace enough oxygen to put the fire out, causing it to re-ignite.


CO2 extinguishers have an advantage over dry chemical extinguishers since they don't leave a harmful residue - a good choice for an electrical fire on a computer or other favorite electronic device such as a stereo or TV.


It is very important  to know what type of extinguisher you are using. Using the wrong type of extinguisher for the wrong type of fire can be life-threatening.


These are only the common types of fire extinguishers. There are many others to choose from. Base your selection on the classification and the extinguisher's compatibility with the items you wish to protect.


Remember that many types of buildings are required by city code and NFPA regulations to not only have fire extinguishers available but also a fire sprinkler system.


The fire system and equipment professionals at Benson Systems can answer all of these questions and more. We offer free advice and when it comes time for you to purchase these systems we offer affordable prices.


 

Benson Systems has more than 50 service vehicles on the road every day to assist you. We cover the state of Arizona from border to border, as well as many other parts of the Southwest.

 

No other company can help you navigate the life safety process like Benson Systems.


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