Fire extinguisher types: which one for which fire

An extinguisher is useful only if its rating and agent suit the fire and the people expected to use it. A water unit may be appropriate for burning paper or wood but dangerous on an energized electrical item or burning cooking oil. A kitchen, workshop and office will therefore need different decisions. In England and Wales, article 13 of the Regulatory Reform (Fire Safety) Order 2005 requires appropriate firefighting equipment where necessary to safeguard relevant people, taking account of the premises, activity, hazards and other circumstances. Scotland and Northern Ireland have separate fire-safety legislation. This guide explains common UK extinguisher labels while using the England and Wales Order for its legal example.

Fire classes are about the fuel

Class A covers ordinary solid combustibles such as wood, paper and many textiles. Class B covers flammable liquids such as petrol and some paints. Class C covers flammable gases. Class D covers combustible metals. Class F covers cooking oils and fats. Electrical equipment is a significant hazard when choosing an agent, but in the current UK classification it is not a separate Class E fire label to place beside A, B, C, D and F. A material can present more than one hazard in the workplace, so read the equipment's actual rating and instructions.

Common extinguisher types and colour bands

Modern portable extinguishers generally have a red body with a coloured zone identifying the agent. Water is associated with a red band or no contrasting band and is commonly used for Class A. Foam has a cream band and can be suitable for some Class A and B fires, subject to its rating. Dry powder commonly has a blue band and may be rated for several classes; ordinary powder is not the same as specialist Class D powder. Carbon dioxide has a black band and is commonly used around certain electrical equipment and Class B liquids. Wet chemical has a yellow band and is designed for Class F cooking-oil hazards. In the UK, extinguisher colour coding follows the British Standard BS EN 3, and the selection, siting, commissioning and maintenance of extinguishers follow BS 5306; government fire-safety guidance reflects these standards. The extinguisher's actual rating and instructions still govern its use.

Do not infer suitability from band colour alone. Products within a category differ, and some additives or specialized agents have different ratings. Do not use a standard water extinguisher on live electrical equipment, flammable liquid or cooking oil. A powder extinguisher can reduce visibility and create breathing problems indoors, and a CO2 unit is not automatically suitable for every enclosed space. Some agents can allow a fire to reignite. Government office and shop fire guidance explains important limitations; a competent fire risk assessment should decide what is appropriate on a particular site.

Select from the premises risk, not a shopping chart

Identify likely fuels, ignition sources, equipment, room layout, escape routes, occupancy and the people available to use equipment. Consider whether an extinguisher can be reached without moving towards the fire or blocking escape. In some settings a fire blanket or fixed system is also relevant. Article 13 requires consideration of premises dimensions and use, equipment, likely substances and the maximum number of people present. It does not set one national extinguisher count per floor for every building.

Government guidance gives examples for particular premises, but those are not universal quantities. A small office may be different from a kitchen with fryers or a workshop with flammable liquids. A technically difficult risk, including combustible metal or industrial process, warrants competent fire-safety input. Train nominated people in the equipment and emergency arrangements. The first priority remains warning others, leaving safely and calling the fire service when necessary. Do not ask an untrained person to fight a growing fire to save property.

Three selection examples

In an office, ordinary paper and furnishing fires may be the main Class A concern, while electrical equipment may require an additional suitable agent. The assessment should consider the layout and whether a person can approach equipment without losing the escape route. It should not assume a CO2 unit is the only device needed for the whole floor or that all modern electronics create a new fire class.

In a commercial kitchen with deep-fat fryers, burning cooking oil creates a Class F hazard. Government small-premises guidance identifies a suitable Class F extinguisher and fire blanket for that area. The site still needs safe siting, worker instruction and an evacuation plan. Water on burning oil can spread the fire, so an ordinary water unit is not a substitute.

In a workshop using flammable liquids, the assessment should examine how liquids are stored and used, possible ignition sources, and whether the fire could spread before anyone can respond. Suitable Class B equipment may be needed, but prevention, storage control and safe escape are at least as important as the extinguisher choice. If a combustible metal or unusual process is present, a general ABC powder label should not be taken as proof of suitability. Seek competent advice and check the exact rating.

These are illustrations of reasoning. They are not a site-specific equipment schedule. The responsible person should document why the chosen agents, ratings, locations and training are appropriate for the premises and review them after a process, layout or occupancy change.

Selection versus inspection and servicing

Selecting the right equipment is only the first stage. Equipment needs to remain accessible and maintained, and people must know how to use it. This page owns types and selection. The queue brief named a UK guide at `/guides/fire-extinguisher-monthly-vs-annual-check`, but the repository check did not find that UK route. A US blog post with a similar subject exists. Do not place the unverified UK link in public copy. Claude can add a validated UK servicing companion if one is later confirmed. The fire risk assessment guide explains the wider premises process, subject to route validation at integration.

The fire safety section and fire risk assessment software page are the relevant commercial destinations. This copy does not claim Complys determines the correct extinguishers, performs servicing or certifies a fire risk assessment.

General information, not legal advice. Verify current requirements against the primary sources linked above.