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2. Immediately dangerous to life or health - Wikipedia

   en.wikipedia.org/wiki/Immediately_dangerous_to...

   The OSHA definition is arguably broad enough to include oxygen-deficient circumstances in the absence of "airborne contaminants", as well as many other chemical, thermal, or pneumatic hazards to life or health (e.g., pure helium, super-cooled or super-heated air, hyperbaric or hypo-baric or submerged chambers, etc.).

3. Confined space - Wikipedia

   en.wikipedia.org/wiki/Confined_space

   A confined space is a ... oxygen concentration is considered safe if it is between 19.5% and 23.5% of the total atmosphere. ... Other countries and authorities use a ...

4. Asphyxiant gas - Wikipedia

   en.wikipedia.org/wiki/Asphyxiant_gas

   Only where elevated concentrations of asphyxiant gases displace the normal oxygen concentration does a hazard exist. Examples are: Environmental gas displacement Confined spaces, combined with accidental gas leaks, such as mines, [1] submarines, [2] [3] refrigerators, [4] or other confined spaces [5]

5. Oxygen compatibility - Wikipedia

   en.wikipedia.org/wiki/Oxygen_compatibility

   In an oxygen system the presence of oxygen is implied, and in a sufficiently high partial pressure of oxygen, most materials can be considered fuel. Potential ignition sources are present in almost all oxygen systems, but fire hazards can be mitigated by controlling the risk factors associated with the oxygen, fuel, or heat, which can limit the ...

6. Hypoxic air technology for fire prevention - Wikipedia

   en.wikipedia.org/wiki/Hypoxic_air_technology_for...

   Sensors continuously measure the levels of oxygen. These sensors provide real-time data to the control system, ensuring that the oxygen level is reduced to a safe level for fire prevention without compromising human safety. Distribution Network: This network delivers nitrogen-enriched air into the protected environment(s).

7. Confined space rescue - Wikipedia

   en.wikipedia.org/wiki/Confined_space_rescue

   Confined space rescue is a subset of technical rescue operations that involves the rescue and recovery of victims trapped in a confined space or in a place only accessible through confined spaces, such as underground vaults, storage silos, storage tanks, or sewers. A warning label on a storage tank, indicating that it is a confined space.