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What Are the 5 Types of Fire Extinguishers in the UK?


What Are the Different Classes of Fire?

There are six different classes of fire in the UK. Each includes a range of flammable and combustible materials, liquids and gases. These include:

  • Class A: Fires caused by combustible materials including paper, fabric, wood and other flammable solids
  • Class B: Fires caused by flammable liquids such as paint, turpentine or petrol
  • Class C: Fires caused by flammable gases including methane, butane or hydrogen 
  • Class D: Fires caused by combustible materials such as potassium, aluminium or magnesium 
  • Class F: Fires caused by cooking oils such as chip-pan fires
  • Electrical Fires: Fires involving electrical equipment such as plug sockets


What Are the Different Types of Fire Extinguishers?

The type of fire extinguishers you need will depend on the classes of fire that may pose a threat to your premises. Here’s a breakdown of the different types of fire extinguishers and the most suitable classes of fire they’re equipped to deal with:


Foam Extinguishers

Foam extinguishers are commonly used to deal with class A+ fires. They are most suited to extinguishing liquid fires (petrol/diesel) and can also be used on flammable solids such as wood and paper.

The businesses or premises that will need to consider installing foam extinguishers include warehouses, residential properties, hospitals, schools and offices. They should be placed by the exits on floors that have been identified as a fire risk for class A or class B.


Water Extinguishers

These extinguishers are most commonly used for class A fire hazards. They’re best equipped for dealing with fires caused by organic materials such as fabrics, textiles, cardboard and paper. 

Similar to foam extinguishers, water extinguishers are mainly suitable for businesses or premises such as hospitals, schools, offices, warehouses and residential properties. 

Water extinguishers should be placed by the exit on floors that have been identified for class A fire risk.


Dry Powder Extinguishers

Dry powder extinguishers are also known as ABC extinguishers because they can deal with fires from classes A, B and C. It’s important to note that these types of extinguishers shouldn’t be used in smaller, enclosed spaces because the released dry powder can be easily inhaled. 

As well as being used for fires caused by organic materials, dry powder extinguishers can also tackle fires caused by flammable liquids and gases. 

If flammable gases are being used on your premises, such as alcohol or petrol, it’s essential you have a dry powder extinguisher equipped to achieve compliance.


Wet Chemical Extinguishers

Wet chemical extinguishers are specially designed to fight class F fires caused by cooking oils and fats. No other type of extinguisher can deal with fires caused by these substances. 

These extinguishers contain a solution of potassium, which effectively attacks the flame by using a combination of a mist and potassium salts to react with the hot oil to stop it from spreading.

If your premises is fitted with a commercial kitchen or canteen, you must have at least one wet chemical extinguisher installed. You may need to install more than one, depending on the size of your premises. 

A wet chemical fire extinguisher needs to be used very carefully as there’s a risk of splashing burning fat or burning oil into the nearby areas. With this in mind, you should work with a fire safety expert who’ll advise you on how to use the extinguisher properly during installation.


Carbon Dioxide (CO2) Extinguishers

Carbon dioxide (CO2) extinguishers are used for electrical fires. They work by displacing the oxygen in the air, suffocating the fire and preventing it from spreading. Carbon dioxide extinguishers can also be used to deal with class B fires caused by flammable liquids such as petrol, oil and solvents. 

Electrical equipment is commonly used in most types of properties. Therefore, it’s likely you’ll need to install at least one carbon dioxide extinguisher. CO2 extinguishers need to be placed near the source of the fire risk or near the fire exits in areas such as offices, kitchens, server rooms and premises with electrical appliances and equipment.

Keeping up with fire safety requirements can be tricky. Legislation changes frequently and there are many different types of equipment you need to consider installing on your premises.

The latest legislation surrounding fire safety is the Building Safety Act, which will receive Royal Assent this year with changes coming into effect within 12 to 18 months.

If you’re responsible for the safety of your premises or have an involvement when managing fire safety, it’s crucial to have a clear understanding of what’s included in the Act.


We’ve Created An Insightful Resource to Help You Get Started

Download a copy of our insightful resource to learn more about the Building Safety Act and how it’ll change fire safety in the UK. The resource also highlights how to best prepare for the new legislation and ensure you always remain compliant.

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