The wrong fire extinguisher can make a fire worse. Use water on an electrical fire and you risk electrocution; use it on burning oil and you spread the fire. This guide explains the main extinguisher types, the fire classes they are designed for, and how to choose the right mix for your premises.

First, understand fire classes

Extinguishers are matched to classes of fire, based on what is burning:

Class A — ordinary combustibles: wood, paper, cloth, plastics.
Class B — flammable liquids: petrol, diesel, oil, paint, solvents.
Class C — flammable gases: LPG, methane.
Class D — combustible metals (specialised industrial settings).
Electrical fires — equipment that is live (often labelled “Class E” informally).
Class K / F — cooking oils and fats (commercial kitchens).

A single premises usually has several of these risks at once — which is why most buildings need more than one type.

The main extinguisher types

ABC dry powder (the all-rounder)

ABC dry powder handles Class A, B, and C fires and is safe on live electrical equipment. Its versatility makes it the most common general-purpose extinguisher for offices, shops, societies, and many industrial areas. The trade-off is mess — the powder residue can damage sensitive electronics.

Best for: general areas, corridors, mixed-risk spaces.

CO2 (carbon dioxide)

CO2 is clean — it leaves no residue — and is designed for electrical fires and flammable liquids (Class B). That makes it ideal near server rooms, electrical panels, and electronics. It does not cool well, so it is not a strong choice for ordinary Class A combustibles on its own.

Best for: server rooms, electrical rooms, labs, near sensitive equipment.

Water (and water-mist)

Water extinguishers fight Class A fires only. Never use plain water on electrical or flammable-liquid fires. Water-mist variants are gentler and can be used more broadly, but the classic water extinguisher is for paper-and-wood risks.

Best for: warehouses with paper/packaging, offices (paired with CO2 for electrical).

Foam (AFFF)

Foam covers Class A and B, forming a blanket that smothers flammable-liquid fires and cools ordinary combustibles. It is a strong choice where flammable liquids are stored or handled.

Best for: fuel storage, workshops, areas with solvents or paints.

K-class / wet chemical

Designed specifically for cooking oils and fats (Class K/F), wet chemical extinguishers cool and chemically react with hot oil to prevent re-ignition. Essential for commercial kitchens, canteens, and banquet halls.

Best for: kitchens, canteens, food courts.

A quick selection table

Area / risk	Recommended extinguisher
General office / society common areas	ABC dry powder
Server room / electrical panel	CO2
Warehouse (paper, packaging)	Water + ABC
Fuel / solvent storage, workshop	Foam (+ ABC)
Commercial kitchen	K-class / wet chemical (+ CO2)

How many, and where to place them?

The number and placement of extinguishers depends on the floor area, the fire load, and the occupancy — and is governed by the relevant Indian Standard (extinguisher selection, installation, and maintenance follow IS 2190). As a practical rule:

Place extinguishers along escape routes and near exits, so people pass them on the way out.
Mount them at an accessible height with clear location signage.
Match the type to the risk in that specific area — a kitchen needs K-class, a server room needs CO2.
Keep them serviced and in date — an expired extinguisher is as good as none.

A fire safety audit will tell you exactly how many of each type your premises needs.

How to read an extinguisher label

Every extinguisher carries a label that tells you exactly what it is for — learn to read it and you’ll never grab the wrong one in a hurry:

The class pictograms show which fires it fights (A, B, C, electrical, K). A red cross through a pictogram means “do NOT use on this class”.
The body or band colour historically indicated the type (red for water, black band for CO2, blue band for dry powder, cream for foam). Always confirm by the label, not colour alone, as conventions vary.
The service tag shows the last service date and the next-due date — check this first on any extinguisher.

Train your staff to glance at the pictograms before acting. A fire safety training session covers exactly this, hands-on.

Common extinguisher mistakes

Even premises with plenty of extinguishers get caught out by these:

One type everywhere. A building with only water extinguishers is dangerous near electrical panels; one with only CO2 won’t handle a paper fire well.
Wrong placement. Extinguishers hidden behind doors, stacked behind boxes, or mounted too high are useless in an emergency.
Expired units. An out-of-date extinguisher may not discharge when you need it.
No training. People freeze or use the wrong unit when they’ve never handled one. A short mock drill fixes this.
No signage. If people can’t find the extinguisher, it doesn’t matter that it exists — pair every unit with location signage.

Match the mix to your building

The right answer is almost always a mix of types placed by risk: ABC dry powder for general areas, CO2 near electrical and server rooms, foam where flammable liquids are handled, and K-class in kitchens. The exact count and capacity depend on floor area and fire load under the applicable standard — which is what a fire safety audit determines for your specific premises.

Don’t forget maintenance

An extinguisher is only useful if it works. That means:

Periodic inspection and pressure checks.
Refilling after any use or on expiry.
Hydrostatic pressure testing of the cylinder at the interval its type requires under IS 2190.
Service tags showing the last service and next-due date.

Letting these lapse is the single most common reason premises fail a fire inspection. Our fire extinguisher supply, refilling, and testing service keeps them inspection-ready, and a fire AMC tracks the due dates for you.

Frequently asked questions

Which fire extinguisher is best for an office?

Most offices use ABC dry powder for general areas and CO2 near electrical equipment and server rooms. The exact mix depends on your layout — an audit confirms it.

Can I use one type of extinguisher everywhere?

ABC dry powder is the most versatile and covers many risks, but it is not right for everything — commercial kitchens need K-class, and server rooms are better served by clean CO2. Match the type to each area’s risk.

How often should extinguishers be refilled or tested?

Extinguishers are inspected periodically and refilled after use or on expiry; hydrostatic testing follows the interval for that extinguisher type under IS 2190. See fire extinguisher refilling and testing.

How many extinguishers does my premises need?

It depends on floor area, fire load, and occupancy, per the applicable standard. A fire safety audit gives you the exact count and placement.

Not sure what your premises needs? Start with a fire safety audit, or go straight to extinguisher supply, refilling, and testing.