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    a class b fire extinguisher is designed to put out which of the following types of fires?


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    ABCs of Fire Extinguishers

    ABCs of Fire Extinguishers

    Portable fire extinguishers are classified by the type of fires they are designed to extinguish. There are five basic classifications of fuel and extinguishers, and extinguishers are labeled with either letter-shaped or pictorial symbols that indicate what types of fires they are intended for.

    Classifications of Fires and Extinguishers

    Class A

    Class A fires involve ordinary combustible materials, such as cloth, wood, paper, rubber, and many plastics. Extinguishers with an A rating are designed to extinguish fires involving these ordinary combustible materials.

    Class B

    Class B fires involve flammable and combustible liquids such as gasoline, alcohol, oil-based paints, lacquers. Therefore, extinguishers with a B rating are designed to extinguish fires involving flammable and combustible liquids.

    Note: Do not attempt to extinguish a fire involving flammable gas unless there is reasonable assurance the source of fuel can be promptly shut off. In fact, if the only fuel burning is the leaking gas, the best method for extinguishing the fire is to shut off the fuel supply. Extinguishing a flammable gas fire, without shutting off the fuel, will allow unburned gas to escape into the atmosphere, which may permit a dangerous accumulation of gas to develop, and an explosion may occur if the gas is exposed to an ignition source.

    Class C

    Class C fires involve energized electrical equipment. Extinguishers with a C rating are designed for use with fires involving energized electrical equipment.

    Class D

    Class D fires involve combustible metals, such as magnesium, titanium, and sodium. Extinguishers with a D rating are designed to extinguish fires involving combustible metals.

    Note: Common extinguishing agents may react with a combustible metal fire causing the severity of the fire to increase. The most common method for extinguishing a combustible metal fire is to cover the burning material with a dry powder, such as sand, which will not react with the material. If you store or use combustible metals, contact the Fire Prevention Services office for a consultation regarding the proper type and amount of extinguishing agent you should have available.

    Class K

    Class K fires involve vegetable oils, animal oils, or fats in cooking appliances. Extinguishers with a K rating are designed to extinguish fires involving vegetable oils, animal oils, or fats utilized in commercial cooking appliances.

    Note: Extinguishers with a K rating are normally required where deep-fryers and/or griddles are utilized to prepare large quantities of food. An example would be a commercial kitchen similar to those found in restaurants and cafeterias.

    Multipurpose Extinguishers

    Most portable extinguishers are rated for use with more than one classification of fire. For example, an extinguisher with a BC rating is suitable for use with fires involving flammable liquids and energized electrical equipment. An extinguisher with an ABC rating is suitable for use with fires involving ordinary combustibles, flammable liquids and energized electrical equipment. An extinguisher that is rated for use with multiple hazards should include a symbol for each hazard type.

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    Classes of Fires & Fire Extinguishers

    The UCLA Health Ambulatory Safety Division mission is to provide managers and employees with the knowledge and tools that will empower them to create and maintain a safe

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    Home Ambulatory Safety Ambulatory Fire and Life Safety Program Classes of Fires & Fire Extinguishers

    Classes of Fires & Fire Extinguishers

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    Classes of Fires

    There are four classes of fires: Class A: Ordinary solid combustibles such as paper, wood, cloth and some plastics.Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.Class C: Electrical equipment, appliances and wiring in which the use or a nonconductive extinguishing agent prevents injury from electrical shock. Don’t use water.Class D: Certain flammable metallic substances such as sodium and potassium. These materials are normally not found in the Medical Center.

    Fire Extinguishers

    Fire extinguishers are classified as types A, ABC, BC or K. It is important to use the right type of extinguisher on the specific class of fire to avoid personal injury or damage to property. The wrong type of extinguisher could cause electrical shock, explosion, or spread the fire.

    Portable extinguishers are useful for putting out small fires; however they are not effective against large, spreading fires. In these situations, doors should be closed to contain the fire.

    Types of Fire ExtinguishersType A: Pressurized water to be used on Class A fire only. Do not use on Class B or C fires; may cause fire spread or electrical shock.Type ABC: Dry chemical effective on all classes of firesType BC: Carbon dioxide to be used on chemical or electrical firesType K:  Used in kitchens on grease firesLocations

    ABC fire extinguishers are located throughout the Medical Centers in corridors. Specialty areas, such as the Operating Rooms and Kitchens have specific extinguishers.


    To use a fire extinguisher, follow the acronym PASS

    Pull - Pull the pin on the extinguisherAim - Aim the nozzle at the base of the fireSqueeze - Squeeze the trigger to release the productSweep - Sweep the nozzle from side to side (slowly)

    To request fire extinguisher training for your department, please contact Ambulatory Safety.

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    What is a Class B Fire Extinguisher Used For?

    Learn what constitutes a Class B fire, what types of extinguishers qualify as Class B fire extinguishers, and what a Class B extinguisher can be used for.


    Posted August 06, 2019 by Koorsen Fire & Security

    Since not all fires are created equal, neither are all fire extinguishers.

    Life and property can be dependent upon the use of the correct fire extinguisher on a fire. This is especially true when fires involve more than standard combustible materials (such as wood, paper, etc.) and include elements such as flammable liquids, as is the case in Class B fires.

    In this blog, read on to learn just what exactly constitutes a Class B fire, what types of extinguishers qualify as Class B fire extinguishers, and to better understand what a Class B fire extinguisher can be used for.

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    What Are Class B Fires? 

    As alluded to above, Class B fires are ones in which flammable liquids and/or gases become involved. They are the fuel source in the fire triangle (fuel, heat, oxygen + chemical reaction).

    Flammable liquids include gasoline, diesel fuel, oils, tars, petroleum greases, solvents, alcohols, and oil-based paints. Flammable gases include things like propane, hydrogen, and butane.

    The fuel sources of class B fires (gases and liquids) can be quite volatile and cannot be extinguished by water, which will only make the fuel source spread, thus spreading the fire. That is why it is important only to use extinguishing agents and methods designed specifically for Class B fires.

    What Types of Extinguishers are Rated as Class B Fire Extinguishers? 

    Due to the nature of the Class B fires’ fuel, the best way to extinguish such a fire is to separate the fuel from its oxygen supply or by interrupting the chemical reaction of the fire triangle.

    There are a variety of fire extinguisher types designed to accomplish this very task specifically on Class B fires:

    CO2: A carbon dioxide fire extinguisher works on a Class B fire by expelling CO2 to suffocate the fire, removing the oxygen necessary to keep it burning. It also helps with removing the heat, as the discharge is very cold.

    However, note that due to how quickly the CO2 gas disperses, this extinguisher is only effective at a relatively close range – about 3-8 feet from the fire.

    Foam: These extinguishers work on both Class A and B fires. The foam agent works on Class B fires by separating the fuel and the oxygen by creating a seal on the surface of the flammable liquid. However, these extinguishers will only be effective when the flammable liquid is not free-flowing.Dry Chemical: Dry chemical extinguishers, whether regular or multipurpose models are classified for B fires as their agent extinguishes a fire by interrupting the chemical reaction of the fire triangle. These extinguishers have a better range, as they use a compressed, non-flammable gas that can propel the dry extinguishing agent further.Clean Agent: A clean agent extinguisher uses an extinguishing agent that works by interrupting the chemical reaction of a fire and/or removing the heat, and is effective on Class B and C fires, and sometimes class A fires (depending on the size of the extinguisher).

    They are called “clean” agents, as they rely on halogen and halocarbon agents that are safer for people and the environment and do not require the same level of clean up after use.

    Most of the above extinguishers above can be rated for more than just Class B fires, but it is always important to pay attention to the label on any extinguisher you may reach for.

    Furthermore, certain types of Class B extinguishers may still not be the most effective for the type of Class B fire your home or work environment is at the highest risk for, since some disperse better than others, among other differences.

    Is Your Home or Business Protected by the Correct Extinguisher? 

    If your home or work environment includes flammable gases or liquids, you need to ensure that it is protected by a Class B fire extinguisher. But determining the best one for your specific hazards can be a bit more complicated.

    To ensure that you have the best fire extinguisher for your home or business, call the experts at Koorsen. They can assess your unique situation and determine the extinguishers that would best protect your people and property.

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    Topics: Fire Extinguisher

    Source : blog.koorsen.com

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