CO2 Fire Extinguishers

Shop CO2 fire extinguishers for fires involving electrical equipment and flammable liquids (Class B). Carbon dioxide puts a fire out by displacing oxygen and leaves no residue, which is why a CO2 extinguisher is the usual choice beside computers, server racks and electrical switchgear. Portable extinguishers are made to BS EN 3, with a red body and a black band or label identifying CO2. Choose from 2kg and 5kg portable CO2 extinguishers and wheeled units from Commander, CommanderEDGE, CheckFire, Firechief, Jewel, Jactone and Ceasefire, and see classes of fire explained for which risks CO2 covers.

CO2 extinguishers we stock

• 2kg CO2 extinguishers for offices, schools and server rooms, including squat, slimline and polished aluminium versions.
• 5kg CO2 extinguishers with hose and horn for larger electrical risks.
• Wheeled CO2 units of 10kg, 20kg and 30kg for larger Class B and electrical risks.
• Remanufactured and refurbished CO2 extinguishers from the CommanderEDGE, Commander Renovate and Jewel ranges.

Browse by brand: Commander fire extinguishers, CheckFire, Firechief, Jewel, Jactone and Ceasefire.

Choosing a CO2 fire extinguisher

• Match it to the risk. CO2 gas is non-conductive and will not damage electrical equipment, so it suits fires involving live electrical equipment. It can also be used on Class B flammable liquid fires.
• Know its limits. CO2 does not cool burning material, so it is not suitable for Class A fires (wood, paper, textiles). Never use it on cooking oil or fat fires. For those, use a wet chemical fire extinguisher.
• Think about the space. CO2 displaces oxygen and can be harmful in confined spaces, so ventilate the area after use.
• Cover the other fire risks. CO2 does not cover Class A risks, so you may also need a water or foam fire extinguisher. Your fire risk assessment, or a competent person, should confirm the type, size and number you need.

Complete the installation with fire extinguisher stands, fire extinguisher ID signs and spares such as replacement horns and pins. You can also keep units protected in fire extinguisher cabinets. For more on label colours and which type suits which fire, read our fire extinguisher colours and types: where a CO2 extinguisher fits guide, or which fire extinguisher for electrical fires.

Why buy from JEM Systems UK

JEM Systems UK is an authorised distributor of CheckFire and Firechief. Every product we sell is genuine, and new extinguishers are supplied brand new and factory sealed. Remanufactured, renovated and refurbished units are described as such on each product page. Buy online with fast, tracked UK delivery.

CO2 fire extinguisher FAQs

What is a CO2 fire extinguisher used for?

It is used mainly on fires involving live electrical equipment, and it is also suitable for Class B fires involving flammable liquids such as petrol or oil.

What colour is a CO2 fire extinguisher?

In the UK, a CO2 extinguisher is identified by a black label or band marked CO2, and it usually has a black discharge horn.

What fires should you not use a CO2 extinguisher on?

Do not use CO2 on Class A fires involving solids, because it does not cool the fuel and the fire can re-ignite. Never use it on cooking oil or fat fires.

Why should you not hold the horn of a CO2 extinguisher?

The horn becomes very cold during discharge and can cause severe frost burns, so never hold the horn when using the extinguisher.

Why does a CO2 extinguisher not have a pressure gauge?

CO2 is stored as a liquid under pressure, so a gauge would not show how much is left. A CO2 extinguisher is checked by weighing it during servicing, and the empty and full weights are marked on the cylinder.

Can a CO2 extinguisher be used on an electrical fire?

Yes. CO2 does not conduct electricity and leaves no residue, so it is a common choice for electrical equipment. Where possible, isolate the power supply as well.

Is it safe to use a CO2 extinguisher in a small room?

Use it with care. CO2 displaces oxygen, so in a small or poorly ventilated room leave the area after discharging and ventilate it before going back in.

What size CO2 extinguisher do I need?

2kg units are common for offices and server rooms, and 5kg units suit larger electrical risks. Wheeled 10kg to 30kg units are for large areas. Your fire risk assessment should confirm the size and number.

Need a different type? See our dry powder fire extinguishers, water mist fire extinguishers, lithium battery fire extinguishers, wheeled fire extinguishers or all fire extinguishers.