We get asked a lot of questions about fire suppression, fire detection, fire alarms, room integrity testing and ongoing system maintenance. Below are some of the questions that come up most often, with straightforward answers to help you understand the options, risks and typical next steps.
If you need advice specific to your building, system or Fire Risk Assessment, please get in touch and we will point you in the right direction.
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A fire suppression system is designed to detect and control or extinguish a fire automatically, usually before the fire can spread and cause serious damage. When suitable detection identifies heat, smoke or flame, the system activates and releases an extinguishing agent into the protected area or directly at the risk. The agent may be an inert gas such as Argonite or Inergen, a clean agent such as FK-5-1-12 (formerly marketed as Novec 1230) or HFC-227ea / FM-200, CO2, water mist, or a specialist kitchen suppression agent. The correct type of system depends on what is being protected, the room or enclosure, whether people normally occupy the area, the fire risk and any insurer or compliance requirements. These systems are commonly used for server rooms, electrical switchgear, industrial plant, commercial kitchens, document stores and other areas where fire could cause major disruption before the fire service arrives.
Fire detection identifies that there may be a fire and raises an alarm. Fire suppression is designed to control or extinguish the fire. A fire detection and alarm system uses devices such as smoke detectors, heat detectors, manual call points or flame detectors to warn occupants and support evacuation. A fire suppression system goes further by releasing an extinguishing agent to tackle the fire at source. Many suppression systems include their own detection and control equipment to trigger the release, but a detection system on its own will not put the fire out. In many buildings, both are required: a fire alarm system for life safety across the premises, and targeted suppression for high-value, high-risk or business-critical areas.
Many gaseous fire suppression systems require inspection and maintenance at least every six months, with more detailed checks carried out periodically in line with the relevant standard, manufacturer guidance, system design and site risk. Requirements can vary depending on the type of system, the suppression agent, the protected risk, insurer expectations and the Fire Risk Assessment. For gaseous systems, BS EN 15004 and ISO 14520 are commonly referenced for design, installation and maintenance. Your insurer, auditors or accreditation requirements may also ask for clear evidence that the system is being maintained properly. Between scheduled visits, responsible site staff should carry out basic visual checks, such as looking at control panels, cylinder pressure gauges and obvious signs of damage or obstruction. If anything appears abnormal, it is better to contact your maintenance provider rather than waiting for the next planned visit.
The right system depends on what you are protecting, the size and construction of the space, whether people normally work in the area, the likely fire type, environmental considerations, downtime risk and insurer requirements. Clean agent systems, such as FK-5-1-12 and HFC-227ea / FM-200, are often used for server rooms, IT rooms and electrical risks because they leave no residue and can be suitable for normally occupied areas when correctly designed, installed and risk assessed. Inert gas systems, such as Argonite, Inergen, Nitrogen and Argon blends, are often used for larger enclosures and work by reducing oxygen concentration to a level that will not support combustion while still allowing safe evacuation when designed correctly. CO2 can be very effective but presents a serious life-safety hazard, so it is normally reserved for unmanned or carefully controlled industrial applications. Water mist and kitchen suppression systems may be more suitable for other types of risk. The honest answer is that a competent survey and design assessment is needed before anyone can recommend the correct system.
There is no reliable single price because every installation is different. Cost depends on the type of suppression system, the agent selected, the size and leakage characteristics of the room or enclosure, cylinder storage requirements, pipework routes, detection and control requirements, interfaces with other systems and whether any building modifications or sealing works are needed. Rather than relying on rough figures, the best approach is to arrange a proper site survey and request a detailed quotation based on a compliant design. The cheapest option is not always the safest or most suitable, and the cost of inadequate protection can be far higher than the cost of installing the right system in the first place.
In most commercial premises, workplaces and sleeping-risk premises, some form of suitable fire detection and warning arrangement will be required. The exact type of system should be determined by a suitable and sufficient Fire Risk Assessment, taking account of the building use, occupancy, layout, escape routes and risk level. In England and Wales, the Regulatory Reform (Fire Safety) Order 2005 places duties on the Responsible Person to take appropriate fire safety precautions. BS 5839-1 is the recognised code of practice for fire detection and fire alarm systems in non-domestic premises and is commonly used to help specify the appropriate system category. Categories range from manual systems through to automatic detection intended to protect life throughout the building. The key point is that the system should be suitable for the actual risk, not simply chosen as a generic package.
Both are types of gaseous fire suppression, but they work in different ways. Clean agents such as FK-5-1-12 and HFC-227ea / FM-200 extinguish fire mainly through heat absorption and chemical or physical interruption of the combustion process. They are usually stored as liquefied compressed gases and can require less cylinder storage space than some inert gas systems. Inert gas systems use naturally occurring gases such as Nitrogen, Argon or blends such as Argonite and Inergen. They work by reducing the oxygen concentration in the protected enclosure so that combustion cannot continue. Both types can be suitable for valuable electrical and electronic risks when correctly designed. The best choice depends on the protected space, occupancy, environmental policy, storage space, discharge pressure, venting requirements and long-term maintenance considerations.
During a service visit, a competent engineer will inspect the key parts of the system and confirm that it remains in serviceable condition. This typically includes checking cylinder pressures or weights, reviewing the control panel, testing detection devices where appropriate, checking manual release and abort facilities, inspecting pipework and nozzles for damage or obstruction, confirming warning signs and indicators, reviewing interfaces with other systems and checking the system logbook. For sealed gaseous systems, the engineer may also review whether a room integrity test is current and whether any changes to the room could affect gas retention. After the visit, you should receive a service report explaining what was checked, any defects found and any recommendations or remedial actions required.
Room integrity testing, often called a door fan test, measures how well a protected room or enclosure can retain the extinguishing gas after discharge. For a gaseous fire suppression system to work properly, the agent must remain at the required concentration for the specified hold time so the fire is extinguished and reignition is prevented. If there are gaps around doors, cable penetrations, raised floors, ceiling voids or service openings, the gas may leak out too quickly and the system may not perform as designed. A calibrated fan is fitted into a doorway to pressurise and depressurise the room, allowing leakage to be measured and modelled. The results are then assessed against the design requirements and relevant standards such as ISO 14520 and BS EN 15004. If the room fails, remedial sealing work may be needed before the system can be considered reliable.
Yes. Fire suppression systems are regularly retrofitted into existing buildings, plant rooms, server rooms, electrical rooms and commercial kitchens. For gaseous systems, pipework usually runs from the cylinder storage location to discharge nozzles inside the protected space, with detection and control equipment installed locally. The main design considerations are whether the room can be sealed sufficiently, where cylinders can be safely located, how pipework can be routed, how the system interfaces with the fire alarm or shutdown controls, and how disruption can be minimised during installation. For commercial kitchens, hood-mounted suppression systems are specifically designed to protect cooking equipment and extract systems. A good installer will plan the work carefully so the system is compliant, practical and installed with as little disruption as possible.
