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'''INERGEN''' ® is a federally registered trademark of Tyco Fire Products LP.  Tyco’s INERGEN® is a blend of inert atmospheric gases that contains 52% nitrogen, 40% argon, 8% carbon dioxide, used for fire suppression system agent. It is considered a clean agent for use in gaseous fire suppression applications. INERGEN® does not contain halocarbons, and has no ozone depletion potential. It is non-toxic. INERGEN® is used at design concentrations of 35-50% to lower the concentration of oxygen to a point that cannot support combustion, but still safe for humans.

INERGEN® and competing fire suppression blends have replaced the use of CO<sub>2</sub> in fixed firefighting applications due to the dangers associated with lack of oxygen following activation of a CO<sub>2</sub> system.  

A component of INERGEN® fire suppression composition is carbon dioxide, which allows the human body to adapt to the environment of reduced oxygen that is present after discharge of agent. Discharge of INERGEN® results in an approximate 2% concentration of carbon dioxide within the space. This directs the human body to take deeper breaths and to make more efficient use of the available oxygen  

The nitrogen and argon components offset the weight of the carbon dioxide, which allows the INERGEN® blend to have the same density as normal atmosphere. This eliminates the need for special considerations to prevent agent leakage.

==Environmentally neutral==
Since INERGEN® blend is composed of natural components that exist in the air – Nitrogen, Argon and Carbon Dioxide – its components simply resume their normal role in the Earth’s life cycle following a discharge, so INERGEN® presents no environmental impact.

Ozone depletion potential (ODP) is zero. Global warming potential (GWP) is zero. Thermal decomposition products (TDP) are zero. Atmospheric lifetime (ALT) is zero. In summary there are never any environmental restrictions on use.

It should be noted that although many other Halon replacement agents have a zero ODP, they may not have zero values for GWP, TDP and ALT. This may see restrictions placed in the future with changes in environmental legislation.

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==Equipment safe==
Many other agents break down in the combustion process forming by-products that are corrosive to electronic components and cards. INERGEN® does not form any corrosive by-products.  

INERGEN® fire suppression blend is discharged into the protected area in a “single phase” so there is no thermal shock or large temperature drop associated with the discharge. Discharge tests conducted demonstrate that the temperature drop is typically less than 2°C in room temperature {{Citation needed|date=November 2013}}.

==Engineering design==
INERGEN® blend exists in a “single phase” throughout the discharge process, that is cylinder storage, pipework distribution and nozzle discharge. This single-phase situation simplifies pipework design and computer software design (pipe friction losses etc.). INERGEN® is stored at high pressure (200 bar) so this allows for long pipe runs, remote cylinder location, and the option of storing the cylinders horizontally.

==Extinguishing properties==
In addition to this extinguishing feature, people are still able to function normally in the atmosphere into which INERGEN® has been injected {{Citation needed|date=November 2013}}. This is attributed to the increased carbon dioxide level, which typically increases to between 2.5% to 5% of the room volume.  

This increased level of carbon dioxide stimulates the rate of respiration and increases the body’s oxygen use efficiency. This compensates for the lower oxygen levels that are present when a fire is being extinguished {{Citation needed|date=November 2013}}.  

As a result, the brain continues to receive the same amount of oxygen in an atmosphere into which Tyco's INERGEN®  blend has been inserted as it woluld in a normal atmosphere, even if the oxygen concentration falls to below 10%. Hence INERGEN® can be used in automatic total flooding systems in areas that are normally occupied.  

The physiology of breathing in a reduced oxygen-increased carbon dioxide environment has been understood since the 1930s and the respiratory concept behind Tyco's INERGEN® blend has been approved by Occupational Health and Safety organizations Worldwide.

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