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Choosing A Fire Extinguisher

Determining Which Extinguisher You Need.

There are many things in every household that can easily catch fire if something goes wrong. Therefore, fire extinguishers are a must in every home no matter where you live (and they’re required by the law in many states): they can literally save your life in case of an emergency.

However, if you want to successfully stop a fire, you always want to make sure you use the right type of fire extinguisher otherwise chances are great that you won’t succeed.

Choosing between the different types of fire extinguishers might be a little daunting at first glance, however, it’s an extremely important step (and you’ll see that it’s not complicated at all).

The flollowing information can help you make an informed decision when buying and using the right type of device when it’s needed.

 

Types of Fire Classes

There are basically five different types of fire extinguishers: Class A, B, C, D, and K. Each of them is suitable to put out different types of fires.



Class A Fire

• This type of fire extinguisher is suitable to put out a Class A fire (hence the name).

• A Class A fire involves ordinary combustible materials, such as paper, cloth, wood, cardboard, and many different types of plastic. These materials are very common in homes and usually leave ash behind when burning.

• Make sure you use a Class A fire extinguisher only for Class A fires: it’s not suitable to put out any other class of fire.

• Color code: GREEN

 



Class B Fire

• A Class B fire is a fire in flammable and combustible liquids or flammable gases, such as oil, grease, oil-based paints, gasoline, kerosene, and propane. Fires involving charcoal lighter fluids also belong to this group.

• Class B fires are particularly common in home kitchens and often start when an unattended pan with oil or grease is left on the stove (Note: in commercial kitchens you need to use a Class K fire extinguisher to put out fires that involve cooking oils or fats).

• Never try to put out a Class B fire with water because that will make the situation even worse and may cause severe injuries.

• Color code: RED

 



Class C Fire

• A Class C fire (also called electrical fire) involves energized electrical equipment (that is, connected to a power source), such as appliances, wires, power strips, and tools.

• Any faulty or overcharged electrical device, tool or wire in a home can be a source of a Class C fire.

• When the power source is removed, a Class C fire turns into a Class A, B or D fire.

• To avoid electrical shock, never use water on a Class C fire.

• Color code: BLUE

 



Class D Fire

• A Class D fire extinguisher is suitable to put out fires in flammable metals, such as potassium, magnesium, calcium, sodium, lithium, and titanium.

• Class D fires are probably the least common type of fires and usually occur in laboratories and factories where larger amounts of combustible metals (and fines of metal) are stored and processed.

• Color code: YELLOW

 



Class K Fire (Class F Outside the US)

• A Class C fire (also called electrical fire) involves energized electrical equipment (that is, connected to a power source), such as appliances, wires, power strips, and tools.

• Any faulty or overcharged electrical device, tool or wire in a home can be a source of a Class C fire.

• When the power source is removed, a Class C fire turns into a Class A, B or D fire.

• To avoid electrical shock, never use water on a Class C fire.

• Color code: BLACK

 

 

Types of Fire Extinguishers Based on Fire Classes

 

ABC Fire Extinguisher

This type of fire extinguisher (also called multi-purpose fire extinguisher) is the one that’s recommended for home use. It’s effective against all types of common home fires, including fires that involve combustible materials, flammable liquids and electrical appliances.
Make sure you keep at least one ABC fire extinguisher on each floor of your house in an easily accessible location and also keep one close to the kitchen. When buying, make sure you choose a reliable model from a reputable manufacturer, such as Amerex or First Alert.

 

Water (Loaded Stream)

Water is a very common type of extinguishing agent that puts out a fire by separating the oxygen source (air) from the fuel source (burning material) and it also helps to take heat away from the fire. Water fire extinguishers can only be used on Class A fires. You should never use it on Class B and C fires because it makes flammable liquids spread faster and conducts electricity, thus it can cause a life-threatening electric shock.

 

Foam

Fire extinguishers with foam are mostly water-based and they work on Class A and B fires. Besides having a cooling effect, they also create a barrier between the burning fuel and the air so they effectively shut off the oxygen supply to the fire. Foams can be used on burning spills or to prevent ignition. As opposed to water stream, fire extinguishers with foam won’t splash the burning liquid, instead, they form a blanket on the surface and smother the flames. One of their advantages is that they don’t leave any powder residue.

 

Dry Chemical

Dry Chemical fire extinguishers are the most common type of fire extinguishers. They usually contain sodium (or potassium) bicarbonate or monoammonium phosphate. Multi-purpose (ABC) fire extinguishers use monoammonium phosphate as an extinguishing agent that can be used on Class A, B and C fires. However, fire extinguishers that contain sodium bicarbonate can only be used on Class B and C fires. Dry chemicals are inert substances that effectively stop the ongoing chemical chain reaction. They cut off the oxygen supply and smother the fire. They’re electrically non-conductive so they work on electrical fires but may damage sensitive appliances. Their major disadvantage is that they always require cleanup after usage.

 

Carbon Dioxide

Carbon dioxide is a gaseous, odorless, electrically non-conductive fire extinguishant. It creates a layer of dry ice on and around the burning material. Dry ice is visually similar to fog, however never try to touch it because it may cause frostbite. It works by cooling its surroundings and removing the oxygen molecules from the system. Carbon dioxide fire extinguishers can be used on Class B and C fires. They’re environmentally safe and leave no residue behind, therefore they are often classified into the clean agent group. However, keep in mind that they work only within short distances, usually between 3 and 10 feet.

 

Wet Chemical

Wet chemical fire extinguishers are mostly used in commercial kitchens and restaurants. They’re made for Class K fires (although they also work on Class A ones). That being said, fires in cooking oils and grease can be effectively put out with wet chemicals, such as potassium acetate. Wet chemicals create a soapy foam on the surface of the flammable liquid that acts as a barrier between the fuel and the oxygen molecules in the air. Furthermore, they also have a cooling effect on the burning oil or grease. Note that it’s recommended to ventilate the room after using a wet chemical fire extinguisher because toxic fumes may form during the process.

 

Clean Agent (Halon & Halotron)

Clean Agent fire extinguishers usually contain halogenated agents (like chlorofluorocarbon, hydrofluorocarbon or hydrochlorofluorocarbon) that are electrically non-conductive, non-corrosive and leave no residue after evaporation. This type of fire extinguisher is a perfect choice when you need to protect valuable and sensitive appliances and assets because halogenated agents won’t damage them by leaving residues (so no cleanup is required after using them). They work on Class A (not all models), B, and C fires as well. Clean Agents provide an environmentally friendly solution as they usually have a short atmospheric lifetime.

 

Dry Powder

Dry Powder fire extinguishers are recommended to use only for Class D fires (combustible metals). They usually contain sodium chloride, finely divided graphite or copper. When exposed to heat, these extinguishing agents form a crust on the surface of the burning metal that blocks the oxygen supply of the fire and they also absorb the thermal energy. Dry Powder fire extinguishers leave residues behind and require thorough cleanup. If you have to use them in an enclosed space, be careful not to inhale the powder.

 

 

What Type of Fire Extinguisher Should You Have in Your Home?

In most cases, multi-purpose ABC (2A:10B:C) fire extinguishers are the best choice for home use. They offer an all-in-one solution and make it unnecessary to keep a separate type of fire extinguisher for each class of fire.

An ABC fire extinguisher can successfully deal with the most common types of household fires and it’s more affordable than other solutions. While having enough ABC fire extinguishers at home is essential, you can add an extra layer of safety by placing an additional Class K fire extinguisher close to your kitchen as this type of fire extinguisher provides the best protection against cooking oil and grease fires. However, in most cases, you will be just fine with an ABC extinguisher.

Before buying a fire extinguisher always read the label to make sure you choose the right type of device. Also, make sure you read and follow the manufacturer’s instructions.