The Complete Guide to Choosing the Right Fire Extinguisher

Fire extinguishers are a first line of defence — but only if you choose the correct type. Many businesses unintentionally create risk by using the wrong extinguisher for the environment.

Here’s a practical guide to help you make the right choice.

1. Water Extinguishers (Class A)

Best for: Paper, wood, textiles
Avoid on: Electrical or flammable liquids
Typical locations: Offices, schools

2. Foam Extinguishers (Class A & B)

Best for: Flammable liquids like petrol and paint
Also works on: Basic solid combustibles
Avoid on: Live electrical equipment unless specified

3. CO₂ Extinguishers (Electrical & Class B)

Best for: Electrical fires, server rooms, workshops
Advantages: No residue, minimal damage
Avoid: Confined spaces — risk of oxygen displacement

4. Powder Extinguishers (A, B, C & Electrical)

Best for: Versatile, great for garages, warehouses, vehicle fleets
Downside: Leaves significant residue, not ideal indoors

5. Wet Chemical Extinguishers (Class F)

Best for: Deep-fat fryers and cooking oils
Typical locations: Restaurants, cafés, commercial kitchens

How Many Do You Need?

Your fire risk assessment should guide placement, but general rules include:

• One extinguisher per 200m²

• One Class A extinguisher per floor

• Specialist extinguishers for high-risk zones

AK Fire Safety can survey your site and provide compliant, maintained extinguishers tailored to your environment.