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Typically gases such as nitrogen or carbon dioxide are used to remove oxygen from a confined space and render it inert. Often an area is made inert in order to remove the potential for fire, or to stop oxidation of a product within a space and keep it from spoiling.  If you are attempting a rescue, or have other need of entry, you must be able to anticipate what changes may result within the space if you return an oxygenated, breathable atmosphere to the area. To do this, you must …