fire-extinguisher

Choosing the Right Fire Extinguishers for Every UK Workplace Risk Scenario

When a small fire starts in a workplace, having the right fire extinguisher on hand can be the difference between a minor incident and a major disaster. These first-response tools are essential for tackling fires in their infancy, preventing them from spreading and causing catastrophic damage. However, not all fires are the same, and neither are all fire extinguishers. Using the wrong type can be ineffective at best and dangerously counterproductive at worst.

For UK employers, providing the correct fire extinguishers is a legal requirement under the Regulatory Reform (Fire Safety) Order 2005. This guide explains the different types of extinguishers, how to match them to specific workplace risks, and what you need to know to keep your premises safe and compliant.

Understanding the Classes of Fire

Before choosing an extinguisher, you must understand the different types of fire, known as “classes.” Each class is determined by the fuel that is burning.

  • Class A: Fires involving solid organic materials like wood, paper, textiles, and coal.
  • Class B: Fires involving flammable liquids like petrol, diesel, paint, and solvents.
  • Class C: Fires involving flammable gases like propane, butane, and methane.
  • Class D: Fires involving flammable metals like magnesium, lithium, and sodium, which are rare but high-risk in specific industrial settings.
  • Class F: Fires involving cooking oils and fats, common in commercial kitchens.
  • Electrical Fires: Fires started by live electrical equipment. This is not a formal class but is a crucial risk to consider.

Your fire risk assessment should identify which of these fire classes are present in your workplace. This will directly inform your choice of extinguishers.

The Different Types of Fire Extinguishers

Fire extinguishers are colour-coded in the UK to help users quickly identify their type and purpose. The entire body of the extinguisher is red, with a coloured band indicating the contents.

1. Water Extinguishers (Red Band)

  • How they work: Cool the fire by soaking the fuel, preventing it from reigniting.
  • Best for: Class A fires (wood, paper, textiles).
  • Where to use: Offices, schools, warehouses, and retail shops where combustible solids are the main risk.
  • Do NOT use on: Flammable liquids (can spread the fire), cooking fat fires (causes a violent reaction), or live electrical equipment (risk of electric shock).

2. Foam Extinguishers (Cream Band)

  • How they work: Create a blanket of foam over the fire, which cools it and smothers it, cutting off the oxygen supply.
  • Best for: Class A and Class B fires. They are excellent for fires involving flammable liquids.
  • Where to use: Garages, workshops, fuel storage areas, and offices with a mix of solid and liquid fire risks.
  • Do NOT use on: Cooking fat fires or significant electrical fires.

3. Dry Powder Extinguishers (Blue Band)

  • How they work: A powder agent smothers the fire by forming a barrier between the fuel and the oxygen.
  • Best for: Known as ABC extinguishers, they are versatile and effective on Class A, B, and C fires. They can also be used on electrical fires, but with caution.
  • Where to use: Vehicles, welding workshops, and areas with mixed fire risks.
  • Caution: The powder creates a huge cloud, which drastically reduces visibility and can cause breathing difficulties. For this reason, they are no longer recommended for use indoors in small, enclosed spaces like offices or homes. The powder is also messy and can damage sensitive electronics.

4. Carbon Dioxide (CO2) Extinguishers (Black Band)

  • How they work: Displace oxygen and cool the fire with a discharge of extremely cold gas.
  • Best for: Fires involving live electrical equipment and Class B flammable liquids.
  • Where to use: Server rooms, electrical switch rooms, and near sensitive electronic equipment, as they leave no residue.
  • Do NOT use on: Cooking fat fires or combustible solids (can scatter burning embers). Be aware that the discharge nozzle gets extremely cold and can cause frostbite if held.

5. Wet Chemical Extinguishers (Yellow Band)

  • How they work: A specialist agent reacts with hot cooking oil (a process called saponification) to form a thick, soapy blanket that smothers the fire and cools the oil, preventing re-ignition.
  • Best for: Class F fires (cooking oils and fats). They also have some effectiveness on Class A fires.
  • Where to use: The essential choice for commercial kitchens, canteens, and restaurants.

Matching Extinguishers to Your Workplace

The key is to conduct a thorough fire risk assessment. Consider each area of your premises and the specific materials and activities within it.

  • Office Environment: The primary risk is usually Class A (paper, furniture). Water extinguishers are a good baseline. If there’s a lot of electrical equipment, a CO2 extinguisher should be placed nearby.
  • Commercial Kitchen: The main risk is Class F from deep fat fryers. A Wet Chemical extinguisher is mandatory. You should also have a CO2 or Foam extinguisher for other risks.
  • Warehouse or Factory: This will have mixed risks. Foam extinguishers are a good all-rounder for solids and potential liquid spills. CO2 extinguishers are needed for electrical control panels. If flammable gases are stored, Dry Powder extinguishers should be available outdoors or in well-ventilated areas.
  • Vehicle Fleet: A small Dry Powder extinguisher is the standard choice for vehicles as it covers most fire types that could occur.

Your Legal Responsibilities as an Employer

Under the Regulatory Reform (Fire Safety) Order 2005, the “Responsible Person” must:

  1. Provide appropriate fire-fighting equipment: This means selecting the correct type and number of extinguishers for the risks identified.
  2. Ensure equipment is correctly sited: Extinguishers should be located on escape routes, usually near exits and fire alarm call points. They must be mounted on a stand or fixed to the wall and be clearly visible.
  3. Maintain the equipment: Extinguishers must be serviced annually by a competent person in accordance with British Standard BS 5306-3. A competent employee should also conduct a visual monthly check to ensure they are undamaged and the pressure gauge is in the green zone.
  4. Train employees: Staff must be trained on how and when to use the extinguishers provided. They should also be taught when not to fight a fire and to evacuate instead.

Conclusion: Take Action for a Safer Workplace

Choosing and maintaining the right fire extinguishers is not a box-ticking exercise; it is a critical component of your fire safety strategy. By conducting a thorough risk assessment and selecting the appropriate equipment, you empower your staff to act decisively in the crucial first moments of a fire.

Don’t guess when it comes to safety. Review your fire risk assessment, check your current extinguishers for type and service dates, and ensure your team is trained and ready. Taking proactive steps today will protect your people, your property, and your business from the devastating impact of fire.