Carbon dioxide is a plentiful, non-corrosive gas that does not support combustion nor react with most substances. It has a low toxicity classi cation by Underwriters Laboratories. It is commonly compressed to the liquid state for storage and transporta- tion in DOT cylinders. Upon release, it discharges under its own pressure giving the appearance of steam as its low temperature crystalizes water in the air. For re suppression purposes the discharge is designed to raise the carbon dioxide concentration in the hazard. This removes the free oxygen which supports combustion, and results in re extinguishment. The resultant lack of free oxygen dictates that total ooding hazards be evacuated immediately, and carbon dioxide from local application be avoided by personnel.
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