CO₂ FIRE
EXTINGUISHERS
IN SOUTH AFRICA
Carbon dioxide fire extinguishers provide clean, fast-response protection for fires involving energised electrical equipment and selected flammable liquids. CO₂ is electrically non-conductive, leaves no powder, foam or water residue and can suppress flames without contaminating sensitive equipment or requiring extensive agent clean-up.
FJ Group Africa supplies, installs, inspects and maintains CO₂ fire extinguishers for offices, server rooms, electrical switch rooms, laboratories, workshops, retail facilities, factories, control rooms and other commercial or industrial premises across South Africa. Each extinguisher arrangement is selected according to the actual fire risk, equipment layout, room conditions, required fire rating, travel distance, user capability and approved fire-safety design.
CO₂ extinguishers are specialist units rather than universal extinguishers. They are highly useful where residue would create additional damage, but they have limited cooling ability, short discharge duration and important safety limitations in enclosed or poorly ventilated areas. A professional assessment should therefore confirm where CO₂ is appropriate and where water, foam, dry powder, wet chemical or another extinguishing medium is also required.
What is a CO₂ fire extinguisher?
A CO₂ fire extinguisher is a portable rechargeable extinguisher containing liquefied carbon dioxide under pressure. The carbon dioxide acts as both the extinguishing agent and the pressure source. When the operating lever is activated, liquid CO₂ travels through the valve and discharge assembly, expands rapidly and leaves the horn as a very cold mixture of gas and fine solid particles.
The extinguisher normally includes a high-pressure steel or aluminium cylinder, valve assembly, safety pin and tamper seal, operating lever, discharge hose or rigid horn assembly, insulated horn grip where provided, siphon tube, identification label, wall bracket and service markings. Unlike most stored-pressure dry powder extinguishers, a conventional CO₂ extinguisher usually does not have a pressure gauge. Its charge is commonly verified by weighing the complete unit and comparing the result with its approved full mass.
Portable units are commonly supplied in sizes such as 2 kg and 5 kg, with larger wheeled configurations available for particular industrial risks. The nominal capacity describes the mass of CO₂ agent, not the total weight of the extinguisher. The complete cylinder can be substantially heavier, which must be considered when selecting equipment for the expected users.
How carbon dioxide suppresses fire
CO₂ suppresses fire mainly by displacing part of the oxygen immediately around the flame and by interrupting the conditions needed for sustained combustion. The rapid expansion of the agent also produces a cooling effect at the point of discharge. Because the gas does not leave a solid or liquid residue, it can reach around equipment and dissipate after the incident once the area is safely ventilated.
The visible white cloud produced during discharge is largely condensed moisture and cold CO₂ particles. It should not be mistaken for smoke. The cloud can temporarily obscure the user’s view, while the loud discharge and force of the gas can startle untrained operators. Practical awareness training helps users understand the operating characteristics before an emergency occurs.
Carbon dioxide does not cool deep-seated Class A materials as effectively as water, and it can disperse quickly in open or windy conditions. A fire may therefore reignite if the hot fuel remains above its ignition temperature or if the electrical supply continues to energise failed equipment. After initial knockdown, the area must remain under observation and the energy or fuel source should be isolated where this can be done safely.
Fire risks suited to CO₂ extinguishers
A correctly approved CO₂ extinguisher is commonly selected for:
- Energised electrical switchgear, distribution boards and control panels
- Computers, servers, telecommunications equipment and electronic cabinets
- Laboratory instruments, test equipment and selected technical work areas
- Class B flammable-liquid fires involving suitable fuels, solvents, paints or oils
- Office equipment rooms, printing areas and locations where powder contamination is undesirable
- Small machinery, motors and electrical equipment where the power cannot immediately be isolated
- Commercial and industrial environments requiring clean local first-response protection
Electrical equipment is an ignition source and shock hazard rather than a fuel class. Once the electrical supply has been safely isolated, the remaining fire should be treated according to the material that is actually burning. For example, burning paper, plastic casing or cable insulation may continue as a Class A-type fire after the power is removed and may require a complementary extinguisher with better cooling performance.
CO₂ is not normally the preferred extinguisher for ordinary combustible materials such as paper, timber, textiles or deep-seated plastics because those materials can retain heat and reignite. It is also not the correct general solution for flammable-gas leaks, combustible metals, lithium-ion battery thermal runaway or commercial cooking-oil fires. Each of these hazards requires an approved, risk-specific response.
Typical applications
CO₂ fire extinguishers are frequently installed in and around:
- Server rooms, network rooms and data-processing areas
- Electrical rooms, substations, switch rooms and motor-control centres
- Control rooms, security rooms and building-management-system areas
- Offices with computers, printers, photocopiers and electronic equipment
- Factories, workshops, test bays and production equipment areas
- Telecommunications rooms and broadcasting facilities
Benefits of CO₂ fire extinguishers
No extinguishing residue. CO₂ evaporates after discharge and does not leave powder, foam or water on equipment and surfaces.
Electrically non-conductive agent. Approved units are suitable for first-response use around energised electrical equipment while safe power isolation remains the priority.
Fast flame knockdown. The agent is released immediately and can rapidly suppress a small Class B or electrical-equipment fire.
Reduced clean-up burden. The absence of residue can shorten the clean-up process and reduce contamination of sensitive equipment.
Simple, recognisable design. The distinctive discharge horn and operating controls support clear identification and user training.
Established technology. CO₂ extinguishers are widely used, rechargeable and supported by a mature fire-equipment service industry.
Useful complementary protection. They can be positioned alongside another extinguisher type to address electrical equipment within a mixed-risk area.
These advantages apply only when the extinguisher is correctly selected, accessible, within its service period and operated by a person who can maintain a safe escape route. The lack of residue does not mean the fire causes no damage. Smoke, heat, soot, electrical faults and corrosive combustion products can still affect equipment.
Important limitations and safety risks
CO₂ reduces oxygen around the flame. In a small, confined or poorly ventilated room, a discharge can create an unsafe atmosphere. Operators must leave immediately if breathing, visibility or escape becomes uncertain, and the area may require ventilation and assessment before re-entry.
The agent, horn and fittings become extremely cold and can cause frostbite. The user must hold only the approved insulated grip or handle and must never direct the discharge at a person or animal.
The discharge force can spread burning liquid if the horn is brought too close or aimed directly into the centre of a shallow spill. The user should approach from a safe distance, aim at the near edge or base of the flames and sweep steadily across the burning surface. Wind and strong ventilation can carry the agent away, reducing its effectiveness.
The cylinder is a high-pressure container and must be protected from heat, impact, corrosion, unauthorised modification and unsuitable brackets. A damaged valve can create a serious projectile hazard. Cylinders must not be drilled, welded, repainted in a way that hides markings, used as doorstops or transported unsecured.
Choosing the correct capacity and fire rating
The mass of CO₂ in the cylinder is only one selection factor. The approved fire rating, discharge duration, effective range, overall extinguisher weight, horn arrangement and expected user must also be considered. A 5 kg unit provides more agent than a 2 kg unit but is heavier to carry, remove from its bracket and control during discharge.
Selection should consider:
- The type, size and location of the credible fire hazard
- The required fire rating and number of extinguishers
- Whether the area is occupied, confined or poorly ventilated
- The value and sensitivity of the equipment being protected
- The physical ability of expected users to lift and operate the unit
- The need for a complementary Class A, foam, powder or wet chemical extinguisher
- Approved building fire plans, insurer requirements and local authority conditions
Correct location and installation
A CO₂ extinguisher should be visible, clearly identified and accessible without requiring a person to move toward the likely fire. Units are commonly placed near exits, along escape routes or at designated fire points close enough to the protected risk for practical use. They should not be hidden behind doors, stock, furniture, equipment or decorative panels.
The bracket, cabinet or stand must support the extinguisher’s total weight and permit rapid removal. The unit should be protected from impact, tampering, corrosion and excessive heat. Vehicle and mobile-plant installations require suitable restraining brackets.
Fire-equipment signage should identify the location. The horn, hose, label and service information must remain secure, undamaged and readable. Site changes should trigger a review of access, travel distance and suitability.
How to use a CO₂ extinguisher safely
Only attempt to fight a fire when it is small, the alarm has been raised, emergency assistance has been requested where necessary and a clear escape route remains behind you. Never delay evacuation to collect an extinguisher. Leave immediately if the fire grows, smoke accumulates, the room becomes difficult to breathe in or the extinguisher does not control the fire.
The commonly taught PASS method can be applied as follows:
- Pull the safety pin and break the tamper seal
- Aim the discharge horn at the base or leading edge of the flames from a safe distance
- Squeeze the operating lever to release the CO₂
- Sweep the horn steadily across the burning area while keeping the exit behind you
Use only the insulated horn grip or handle. Do not touch the metal horn, discharge fitting or frozen surfaces. Avoid kneeling in spilled flammable liquid and do not approach so closely that the discharge spreads the fuel. For an electrical fire, isolate power when this can be done safely and without delaying evacuation.
When the flames appear extinguished, stop at a safe distance and watch for reignition. Do not turn your back on the incident. Any extinguisher that has been discharged, even briefly, must be tagged, removed from service and sent for competent inspection and recharge.
Routine visual inspections
Regular site checks should confirm that each unit remains in position, unobstructed, undamaged and appropriate for the current fire risk.
A routine visual inspection should include:
- Cylinder, valve, lever, hose and horn free from visible damage
- Safety pin and tamper seal present and intact
- Operating label, capacity, approval markings and instructions readable
- No corrosion, dents, gouges, leakage, fire exposure or unauthorised repair
- Horn and insulated grip secure and in serviceable condition
- Bracket or cabinet firmly fixed and suitable for the extinguisher weight
- Service label present and scheduled service not overdue
- No obstruction preventing immediate access or removal
Because a normal CO₂ extinguisher does not rely on a pressure gauge, apparent condition cannot confirm the correct charge. Significant mass loss may indicate leakage. Any suspected loss, damaged valve, broken seal, missing horn or evidence of discharge requires assessment by competent authorised personnel.
Servicing and maintenance in South Africa
Portable rechargeable CO₂ extinguishers supplied for South African premises should comply with the applicable product, installation, inspection and maintenance requirements. SANS 1567 applies to portable rechargeable carbon-dioxide extinguishers, while the use and control of portable extinguishers and the reconditioning of rechargeable equipment are addressed through the relevant SANS requirements, including SANS 10105-1 and SANS 1475-1 where applicable.
Formal servicing, recharge, repair and pressure testing must be performed by competent authorised personnel using approved equipment and procedures. The required work depends on the unit’s age, condition, markings and history. It must also be examined after discharge, damage, suspected leakage or excessive heat exposure.
Service may include weighing the unit, checking the cylinder, valve, horn and hose, replacing seals and inspecting for corrosion or damage. Pressure testing and cylinder assessment are completed when due, with records identifying the work and responsible service organisation.
CO₂ cylinders must be refilled with the correct agent quantity and approved components. Overfilling or unapproved valve work can create dangerous pressure. Obsolete, severely corroded or damaged equipment should be withdrawn and replaced.
After a CO₂ extinguisher discharge
A confined room may contain elevated CO₂ levels after discharge. Re-entry should only occur once the atmosphere has been made safe through appropriate ventilation and assessment. Personnel should not enter simply because the visible cloud has disappeared. The discharged extinguisher must be replaced promptly so that the required fire protection is restored.
CO₂ extinguisher services from FJ Group Africa
FJ Group Africa supports the full lifecycle of portable CO₂ fire extinguishers:
- Fire-risk surveys and extinguisher selection
- Supply of approved 2 kg, 5 kg and suitable industrial CO₂ units
- Mounting brackets, cabinets, stands and fire-equipment signage
- Installation and positioning according to approved site requirements
- Routine inspection programmes and fire-equipment registers
- Scheduled servicing through competent authorised personnel
Frequently asked questions
What fires can a CO₂ extinguisher be used on?
CO₂ extinguishers are commonly used for energised electrical equipment and approved Class B flammable-liquid risks. The extinguisher label and fire rating must always be checked before use.
Why does a CO₂ extinguisher not have a pressure gauge?
Carbon dioxide is stored as a liquefied gas and provides its own discharge pressure. A conventional pressure gauge would not reliably show the amount of agent remaining. The charge is normally checked by weighing the extinguisher and comparing it with the approved full mass.
Must the extinguisher be serviced after a short discharge?
Yes. Any discharge can reduce the agent mass and compromise the sealed condition of the unit. It must be inspected, recharged and returned to service by authorised competent personnel.
Request a CO₂ fire extinguisher assessment or quotation
For CO₂ fire extinguishers for offices, server rooms, electrical switch rooms, control rooms, laboratories, retail premises, workshops and industrial facilities, contact FJ Group Africa. We will review the fire hazards, occupancy, room conditions and equipment layout before recommending a practical and compliant extinguisher solution.
