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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 {{Citation needed|date=November 2013}}. InergenNERGEN® does not contain [[halocarbons]], and has no [[ozone depletion]] potential. It is non-toxic. InergenNERGEN® 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 hasNERGEN®  and competing fire suppression blends have replaced the use of [[CO2|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 {{Citation needed|date=August 2013}}. The name is a [[portmanteau]] of the name of the lead [[engineer]] on the project, Dr Innes R. Geneson (and assisted by Dr Alan Steele).

A component of Inerge⏎
⏎
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 InergenNERGEN® 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 {{Citation needed|date=November 2013}}.

The nitrogen and argon components offset the weight of the carbon dioxide, which allows the InergenNERGEN® blend to have the same density as normal atmosphere. This eliminates the need for special considerations to prevent agent leakage {{Citation needed|date=November 2013}}.

==Environmentally neutralperfect==
Since InergNERGEN® 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 eEarth’s life cycle following a discharge, so InergenNERGEN® presents no environmental impact {{Citation needed|date=November 2013}}.

In the modest quantities used by firefighting the above gasses have no [[Ozone depletion]] or [[Global warming]] issues {{Citation needed|date=November 2013}}.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.⏎


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

InergenNERGEN®  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==
InergenNERGEN® 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.). InergenNERGEN® 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 InergenNERGEN® 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 Inergen atmosphere into which Tyco’s INERGEN®  blend has been inserted as it would in a normal atmosphere {{Citation needed|date=November 2013}}, even if the oxygen concentration falls to below 10%. Hence InergenNERGEN® 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 Inergen respiratory concept behind Tyco’s INERGEN®  blend has been approved by Occupational Health and Safety organiszations Worldwide {{Citation needed|date=November 2013}}. 

People can breathe within a correctly designed InergenNERGEN® blend inserted atmosphere without any long-term ill effects {{Citation needed|date=November 2013}}. InergenTyco’s INERGEN® is non toxic, so it has been possible for the agent to be medically tested on people in both Europe and the USA. This is not true for Halocarbon based products, which are all lethal at high concentrations and still toxic even at low concentrations {{Citation needed|date=November 2013}}, hence tests on these agents have been limited to laboratory animals.

==Advantages==
Exiting during an InergNERGEN® blend discharge situation is made safer as the agent does not fog the atmosphere and no impairment of vision occurs.
* Inergen contains no [[halocarbons]]. It has no [[ozone depletion]] potential, and unlike halocarbon agents, it will not produce toxic or corrosive decomposition. Inergen and [[Argonite]] has the same potent suppressing effect.
* Based on an acute hypoxia point of view, Inergen is comparatively safer than any other inert gas based extinguishing agents in applications where evacuation may not be possible prior to the application of the agent {{Citation needed|date=August 2013}}.
* Inergen systems reduce oxygen concentration only enough to suppress combustion while stimulating breathing efficiency to a disproportional advantage (as with any other suppression system, human evacuation is always recommended).
* Inergen is non-toxic, and does not threaten the health compared to Halon-based or halocarbon agents {{Citation needed|date=August 2013}}.
* Inergen has almost the same density as normal atmospheric air. No particular support or precautions are needed should agent leakage occur {{Citation needed|date=November 2013}}.
* Normal in gas suppression is the "fogging effect", and because Inergen creates no 'fog' during discharge, escape routes during fire are still visible.

==Disadvantages==
* Unlike carbon dioxide or halocarbon agents, Inergen agent does not liquefy under pressure {{Citation needed|date=November 2013}}. Hence InergenTyco’s INERGEN® contains no [[halocarbons]]. It has no [[ozone depletion]] potential, and unlike halocarbon agents, it will not produce toxic or corrosive decomposition, has the same potent suppressing effect as Argonite.
* Based on an acute hypoxia point of view, INERGEN® blend is comparatively safer than any other inert gas based extinguishing agents in applications where evacuation may not be possible prior to the application of the agent {{Citation needed|date=August 2013}}.
* Tyco’s INERGEN® systems reduce oxygen concentration only enough to suppress combustion while stimulating breathing efficiency to a disproportional advantage (as with any other suppression system, human evacuation is always recommended).
* INERGEN® blend is non-toxic, and does not threaten the health compared to Halon-based or halocarbon agents {{Citation needed|date=August 2013}}.
* INERGEN® blend has almost the same density as normal atmospheric air. No particular support or precautions are needed should agent leakage occur {{Citation needed|date=November 2013}}.
* Normal in gas suppression is the "fogging effect", and because Tyco's INERGEN® blend creates no 'fog' during discharge, escape routes during fire are still visible.

==Disadvantages==
* Unlike carbon dioxide or halocarbon agents, INERGEN® agent does not liquefy under pressure {{Citation needed|date=November 2013}}. Hence INERGEN® requires more space for storage tanks.

==See also==
* [[Argonite]]
* [[FE-13]]
* [[FM-200]]
* [[Halon 1211]]
* [[Halon 1301]]

==External links==
*[http://www.getzfire.com/pdf/MSDS/Inergen.pdf] Material Safety Data Sheet (2010)
*[http://www.youtube.com/watch?v=M_qEJJHEImI&feature=related Inergen Video]
*[http://www.youtube.com/watch?v=uuEylKMvbjw Inergen Dump Video]

[[Category:Fire suppression agents]]
[[Category:Industrial gases]]