Inergen INEI

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Inergen INEI
dy demand
for fire extinguishing
  • EA EU certified
Main technical data and characteristics
The content of the main components, %
Carbon dioxide(CO2)
Boiling point temperature
Vapor pressure at 20 degrees C, MPa
Ozone Depletion Potential (ODP)
0 (Zero)
Minimum volume fire extinguishing concentration for extinguishing n-heptane
The service life within a fire suppression system installation, years
Mass fraction of water vapor, %
Operating temperature range, °C
From -40 to +50 degrees Celsius
The gas fire extinguishing agent (GFEA) Inergen INEI is a mixture of natural inert gases that utilizes their respective advantages:
It consists of 52% nitrogen, 40% argon, and 8% carbon dioxide.
Refilling costs for Inergen INEI are slightly higher compared to nitrogen or argon due to its complex composition.
According to the current regulation, the fire-extinguishing concentration is 36.5% by volume. In terms of extinguishing mechanism, this GFEA functions as a displacement gas. In the event of a fire, it is released into the room, diluting the atmosphere to reduce the oxygen concentration below a certain threshold.

The principle of extinguishing

Under normal conditions, in the atmosphere we breathe, the oxygen concentration is approximately 20-22%. At this concentration, any combustible substance can easily ignite. Our goal during fire suppression is to lower this concentration below a threshold of 15%. By reducing the oxygen supply to the fire source, the combustion process is halted.

Why is carbon dioxide used in addition to argon and nitrogen in Inergen INEI?

Carbon dioxide (a suffocating gas) is intentionally added to this fire extinguishing agent to increase the CO2 concentration in the room if there are people present. According to European standards, firefighting can commence before people evacuate the protected area. The main concern with all diluting gases is the potential for oxygen concentration to drop below a level at which a person can breathe normally and comfortably. A concentration of 4% carbon dioxide, which is created when using such a fire extinguishing agent, is non-toxic and not hazardous to humans. However, it enhances the absorption of oxygen into the bloodstream, thereby enriching the blood more intensively. Even in conditions of limited oxygen in the protected area, a person can breathe normally and evacuate without any consequences for their health.

Ecological safety

Inergen INEI (IG 541) gas fire extinguishing agent is considered the most environmentally safe worldwide:

  • Zero ozone depletion potential.
  • It does not cause corrosion to metals.
  • It does not damage electronics.
  • Chemically inert.
  • Thermally stable.
  • Spillage is eliminated.
  • It is practically insoluble in water.