It is a volume extinguishing and gas get into entire volume of the room and also into small and inaccessible places. It is able to extinguish a fire even in places where other methods are failing.

Components by companies: Fire Eater, Kentec Electronics, System sensors

Used extinguishing gas: Natural - INERGEN

The system of volumetric gas extinguishing is used to protect rooms with objects of high value, Where it is needed fast and effective fire extinguishing system, where is likely the presence of humans and where fire may occur in arbitrary hour during the day or at night and where could lead to irreparable damage at equipment of room. System quick and timely extinguish a resulting fire and thereby avoiding the more extensive damage to equipment, data etc. In protected rooms.

Listed fixed extinguishing system is installed to the places like server and computer rooms, control rooms, and where the use of water, foam, powder or aerosol is out of question.

Design of the system is always in accordance with valid legislation and puts a big emphasis on the inspection and testing of individual components which are identified by production number in the production and every one component has its own test protocol and marking the declaration of conformity with the required standards. The system can be designed in several variants according to user requirements and needs for maximum protection , e. g. rooms with lower ceilings, double floor and the like. One system can be designed eg. for the protection of the one room or several rooms, as well the entire buildings and control elements can be placed directly at the protected premises or centralized to the central security, or interconnected to an electric fire alarm system. For the optimum design of the system is used specialized software.

The extinguishing agent INERGEN belongs to the group so-called natural gases which have in contrast to the chemical gases and other chemical extinguishing agents advantage that it has no negative impact on the environment, electrical and other sensitive equipment, and does not damage them.

INERGEN consists of gases present in the Earth's atmosphere. It is the inert, not liquefied, non-toxic and not explosive gas. The aim of extinguishing is to reduce the level of oxygen at 10% -14% and replacement by a different gas, with decreasing oxygen level below 15% occurs during 30 to 45 seconds to extinguish a possible fire.

It is a volume extinguishing and gas get into entire volume of the room and also into small and inaccessible places. It is able to extinguish a fire even in places where other methods are failing.

The unique property of INERGEN is that it contains 8% CO2. It has significant physiological effect on the human organism, because it increases the amount of blood pumped by the heart and consequently the body receives the same amount of oxygen as in a normal atmosphere. Relatively low content of carbon dioxide in the mixture at the same time ensures that people who for some reason have not had time to leave the affected area, or are imprisoned in it, can esily breathe and contact with the gas does not damage their health. (accompanied by extensive and unambiguous documentation, which based on the verification of more than 5000 complex tests). Relative density of INERGEN approximates to normal density of air. This relation ensures a uniquely long residence time of gas at the application site, What is preferred as opposed to use of halons and their substitutes based on chemical gases, which very quickly escape from fire area and may occur re-ignition. The rooms where occurs the extinguishing by chemical gases must be more thoroughly sealed. Simultaneously, halon and similar chemical substitutes upon contact with fire creates toxic compounds and substances that can damage eg. Electrical components or valuable documents. Due to the fact that INERGEN does not perform extinguishing by influence of chemical contact, don’t occurs any by-products and any damage on valuable equipment.

Specification of extinguishing agent

INERGEN is mixture of gases – nitrogen, argon and carbon dioxide. INERGEN extinguishes fire by reducing the oxygen content in the area to less than 15%, when flammable materials can no longer burn.

  • a mixture of natural gases from the atmosphere
  • after release in no way damages the environment
  • in contrast to chemical extinguishing agents will never its use limited
  • is non-conductive and reduces humidity of air
  • It's a little heavier than air and therefore remains long time in an enclosed space after release, and also it is really no problem ventilate it after the fire
  • inertness of gas eliminates the corrosive effects
  • after release is in the area normal visibility
  • stored as a gas at a pressure of 300 bar (non-liquefied)

INERGEN® - composition:

N2 - 52 %
Ar - 40 %
CO2 - 8 %

Humidity - max - 0,005% of volume

INERGEN® - chemical and physical properties:

  • form: gas – inert, non-toxic, nonflammable
  • color: colorless
  • odor: odorless
  • density: t = 15ºC….1,4236 kg/m³
  • relative ratio of air pr =1,088

Safe for human life


Fixed extinguishing system - gas INERGEN usually consists of six main parts:

1. Electrical control and delay device

Electrical control and delay device automatically manages all fire extinguishing system and manages all equipment necessary for liquidation of possible fire. Simultaneously the control panel performs at regular intervals checking the integrity of the system, which tests all electrical circuits, their integrity and readiness for use. If the panel detects a fault then runs optical and acoustic signaling of fault. The control panel can be connected to EPS or other information systems or control elements.

2. Detectors

The role of the detectors is to detect a fire as soon as possible. If the fire is detected by detector, electronic signal notifies the control panel and it instructs for extinguishing. The choice of process for the location of the detectors always solves specific project based on investors requests and the environment where fire extinguishing equipment is. It is used more-loop dependence and reliable detectors due to the elimination of false alarms.

There are two major methods of detecting:

a) point detection by smoke detectors

b) detection system by smoke aspirating detectors with the high-sensitive laser detectors. Those detectors can monitor entire space and also the individual places with increased risk. (For example, specially the equipment positioned in the room.)

3. Manual switch

If a fire occurs in the presence of persons, it is possible to manually start the extinguishing. Relevant switch is next to all entry doors to the room. In this way, persons can activate the system when leaving the room.

4. Signaling device

As soon as extinguishing started, a signaling device placed over the door start emitting a sound and light warning signals. Before self extinguishing, the equipment makes pulsing sound for 30 seconds. During this time, persons in the room to leave the room. After those 30 seconds the sound stabilized. Monotone sound means that extinguishing is in action.

The time before the alarm - 30 seconds can be set to any other value.

5. Pressure vessels with INERGEN

Extinguishing agent INERGEN is stored in pressure vessels. Vessels can be placed in vertical and horizontal position. Vessels can be placed in the protected room even in remote rooms (machinery spaces) which gives a sufficient freedom in the choice of space to place the pressure vessels. Vessels are equipped with a pressure gauge for checking the pressure in the vessels. Extingiushing agent in pressure vessels is stored in gaseous state, which doesn’t make any vapors or mists during fire fighting, but the system uses compressing under high pressure - 300 bar what allows reduce number of the pressure vessels for storage. For example, for room 300m3 is necessary place to location of pressure vessels of the surface 0.5 m2.

6. Overpressure valve

When will release the extinguishing agent INERGEN into the room, it creates overpressure at the room. Overpressure must be continuously balanced to which is used overpressure valve. Overpressure valve is individually designed for specific project such as to correspond to the configuration of the used system.

Fixed extinquishing systems - gas INERGEN is in accordance with the following rules

EU Directive

  • 89/106/EHS - EU Directive relating to construction products 
  • 97/23/EHS – PED, EU Directive on pressure equipment
  • 99/36/EHS – TPED, EU Directive on transportable pressure equipment
  • 73/23/EHS – LVD, EU Directive relating to electrical equipment designed for use within certain voltage limits
  • 89/336/EHS – EU Directive  relating to electromagnetic compatibility

Acts and regulations SR

  • Act no.314/2001 Coll. on Protection from Fires as amended
  • Decree of the Ministry of Interior of the Slovak Republic no.121/2002 Coll. on fire prevention as amended.
  • Decree of the Ministry of Interior of the Slovak Republic no.169/2006 on the specific properties of fixed fire extinguishing devices and semi-fixed fire extinguishing devices and on the operating conditions and regular inspections thereof
  • Act No. 90/1998 Coll. on building product as amended.

The basic standards used:

  • STN EN 15004-1 Fixed firefighting systems. Gas extinguishing systems. Part 1: Design, installation and maintenance (ISO 14520-1:2006, modified)
  • STN EN 15004-10 Fixed firefighting systems - Gas extinguishing systems - Part 10: Physical properties and system design of gas extinguishing systems for IG-541 extinguishant (ISO 14520-15:2005, modified)
  • STN EN 12094-1 Fixed firefighting systems. Components for gas extinguishing systems. Part 1: Requirements and test methods for electrical automatic control and delay devices
  • STN EN 12094-4 Fixed firefighting systems. Components for gas extinguishing systems. Part 4: Requirements and test methods for container valve assemblies and their actuators
  • STN EN 12094-13 Fixed firefighting systems. Components for gas extinguishing systems. Part 13: Requirements and test methods for check valves and non-return valves
  • STN EN 54-2 a STN 54-4  Fire detection and fire alarm systems
  • STN EN 54-20 Fire detection and fire alarm systems. Part 20: Aspirating smoke detectors