If you run a business in the UK, understanding the types of fire extinguisher and how to commission them is essential for compliance and safety. This guide explains the five common extinguisher types, the six fire classes, and the commissioning process to ensure your premises are adequately protected.
Introduction: Why the right fire extinguishers matter
Fire safety is not just about having extinguishers on the wall; it’s about choosing the correct types for the fuels present in your building and ensuring they are properly commissioned. The question “What are the types of fire extinguisher?” has a straightforward answer, but applying that answer correctly requires knowing which fire classes are relevant to your operations and how to maintain compliance with UK fire safety regulations. By selecting the right extinguishers and having them professionally commissioned, you reduce risk, protect people, and avoid penalties.
The five common types of fire extinguisher
There are five fire extinguisher types in common use in the UK, each designed for a specific class of fire. Using the wrong extinguisher can be ineffective or dangerous, so it’s important to match the extinguisher type to the potential fuel.
- Water extinguishers
- Best suited for Class A fires (flammable solids such as wood, paper, textiles).
- Not appropriate for electrical fires or flammable liquids.
- Foam extinguishers
- Effective for Class A and Class B fires (flammable liquids like petrol and solvents).
- Provide a creamy foam blanket that cools and separates the fuel from the air.
- CO2 extinguishers
- Suitable for electrical fires (Class E in some classifications) and small kitchen areas.
- Leave no residue, but can be hazardous to occupants in enclosed spaces.
- Dry powder extinguishers
- Versatile and can be used on Classes A, B, C (flammable gases), and electrical fires.
- Leave a powder residue that can damage sensitive equipment; not ideal for areas with electronics.
- Wet chemical extinguishers
- Specifically designed for cooking oil fires (Class F).
- Reacts with cooking fats to saponify and form a soapy layer that cools and smothers the fire.
The six fire classes and what fuels they cover
Understanding the fire classes helps you determine where to place each extinguisher and which type to use.
- Class A fires: Flammable solids such as wood, paper, textiles.
- Class B fires: Flammable liquids such as petrol, oil, paints, and spirits.
- Class C fires: Flammable gases such as propane and butane.
- Class D fires: Flammable metals such as magnesium, lithium, and potassium.
- Electrical fires: Fires involving electrical equipment, such as computers, printers, and wiring.
- Class F fires: Cooking oils, fats, and commercial fryer oils (common in kitchens).
Note that in some classifications, electrical fires fall under Class E or are treated as a separate category alongside Class C and Class F, depending on regional guidance. For UK premises, the focus is on selecting extinguishers appropriate for the likely fuels and the presence of electrical equipment.
Fire extinguisher commissioning: legal requirement and practical steps
Commissioning is a formal, professional verification that extinguishers are installed correctly and ready for use. In the UK, having extinguishers installed is not enough; they must be commissioned to be compliant with current regulations.
- What commissioning checks involve:
- Verifying that extinguishers are installed in the correct locations and accessible when needed.
- Ensuring hoses, horns, and other components are attached correctly.
- Checking that each extinguisher has the appropriate weight and pressure for its type.
- Inspecting for physical damage or tampering and confirming seals are intact.
- Why commissioning matters:
- Without commissioning, extinguishers may be non-compliant even if the right types and sizes are present.
- A commissioning certificate provides formal proof that the extinguishers meet UK regulations.
- Regular re-tests (typically annually, or according to manufacturer guidance) ensure continued effectiveness.
If you need your extinguishers commissioned or want tailored fire safety compliance advice, consider engaging professionally certified fire alarm installers and accredited fire safety providers such as RV Fire Systems. They can assess your premises, recommend the right extinguisher mix, and supply the required commissioning certificate.
Practical considerations for choosing and placing extinguishers
- Assess the premises:
- Identify potential fire hazards and fuels (wood, solvents, cooking oils, electrical equipment, gases, metals).
- Consider the layout, occupancy, and potential evacuation routes.
- Match extinguishers to hazards:
- Class A areas (offices, storage of paper) → Water or foam extinguishers.
- Areas with flammable liquids (kitchens, maintenance bays) → Foam, dry powder, or CO2 where appropriate.
- Electrical rooms → CO2 or dry chemical extinguishers (avoid water-based types).
- Commercial kitchens → Wet chemical extinguishers for Class F fires.
- Placement and accessibility:
- Extinguishers should be easily reachable without obstacles and clearly signposted.
- For higher-risk areas, consider additional units or wall-mounted cabinets.
- Use a clear maintenance log and ensure visibility of the commissioning certificates.
Training and awareness: crucial companions to extinguishers
Having the right extinguishers and commissioning certificates is only part of the equation. Staff training is essential so people know how to respond in a fire emergency and how to operate extinguishers safely.
- Basic training topics:
- How to identify fire classes and select the appropriate extinguisher.
- The PASS technique (Pull, Aim, Squeeze, Sweep) for using extinguishers.
- What to do if the fire cannot be controlled.
- Drills and refreshers:
- Regular fire drills help employees react calmly and efficiently.
- Schedule periodic refresher training and equipment checks in accordance with regulations.
In the UK, knowing What are the Types of Fire Extinguisher aligns with broader fire safety commitments. Choosing the right extinguishers for each fire class, ensuring proper commissioning, and maintaining ongoing vigilance through training and regular checks are all essential elements of a compliant and safe workplace. With the right mix of water, foam, CO2, dry powder, and wet chemical extinguishers, plus certified commissioning, your business premises will be well-protected and prepared to respond effectively in an emergency. For tailored guidance and reliable installation and commissioning services, reach out to a professionally certified fire safety provider to ensure you meet current UK regulations and keep everyone safe.
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