Start With the Fire Class
Extinguishers are matched to fire classes, not the other way round, so selection always begins with the kind of fire that is credible in a space. The common classes are: Class A (ordinary combustibles such as wood, paper, and textiles), Class B (flammable liquids), Class C (energised electrical equipment), Class D (combustible metals), and Class K (cooking oils and fats). A single room can present more than one class, which is why many spaces need more than one type of extinguisher, or a type rated for several classes.
The Main Extinguisher Types
Water and water mist
Effective on Class A fires, where they cool the burning material. Water mist can also suit some additional risks. Plain water should not be used on live electrical equipment or on flammable-liquid fires unless the unit is specifically rated for it.
Foam
Good for Class A and Class B fires. Foam forms a blanket over a flammable liquid that smothers the fire and suppresses vapours, which makes it useful in mixed-risk areas where both ordinary combustibles and liquids are present.
Dry chemical powder (DCP)
Versatile across Class A, B, and C fires depending on the powder, which makes it one of the most common extinguishers in general, commercial, and industrial areas. Its versatility is its strength, though the residue means it is less ideal around sensitive electronics.
Carbon dioxide (CO2)
Clean and residue-free, suited to Class B and electrical risks, which is why CO2 units are common near electronics, switchrooms, and laboratories. Because they leave nothing behind, equipment is protected as well as the room.
Wet chemical
Designed for Class K cooking-oil and fat fires, where they cool and chemically react with the hot oil. They belong in commercial kitchens, where deep-fat fryers are a specific and serious hazard.
Placement and Selection Basics (NFPA 10)
NFPA 10 covers how portable fire extinguishers are selected, sized, located, and maintained. In practice that means matching the type to the hazard, providing enough units for the area and travel distance, mounting them where they are visible and reachable along normal paths of travel, and keeping them serviced and tagged. The right extinguisher in the wrong place, hidden, blocked, or unserviced, is not protection, so placement is treated with the same care as selection.
Inspection and Servicing
Extinguishers need a regular quick visual check to confirm they are present, charged, and undamaged, a periodic professional service, and hydrostatic testing at intervals that depend on the extinguisher type. A structured maintenance programme keeps every unit charged, tagged, and ready, and keeps the records the Civil Defense expects. This routine is part of the wider maintenance regime described in our NFPA 25 inspection frequency guide and can be delivered under a maintenance and AMC programme.
Choosing for Your Facility
An office, a commercial kitchen, a workshop, a warehouse, and a server room each need different extinguishers, and most sites need a considered mix rather than a single type everywhere. The selection follows the hazards present, the NFPA standards, and the building’s fire strategy. SFFECO manufactures a full range of portable and wheeled extinguishers and can advise on the right selection for each area, then supply and maintain them across your site.
