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NOTE: This is an unformatted excerpt from our online fire protection training library.

Introduction to Clean Agents

Clean Agents Utilized

Historical Clean Agents - Carbon Dioxide

Carbon dioxide, CO2, has long been used as a fire extinguishing agent. It is an inert gaseous agent by classification and is employed at design concentrations typically ranging from 34% to 50% by volume. This design concentration range corresponds to an agent mass requirement range of 5.1 to 8.6 lb/100 ft3 of protected volume (82.1 to 137 kg/ 100 m3 of protected volume). It is stored in the discharge cylinders as a liquid under its own vapor pressure of 830 psig (58.2 bar).

Carbon dioxide is, however, toxic at its design concentrations and precautions must be taken to avoid exposure of personnel inside the protected space to the agent.

CO2 concentrations in excess of 5% by volume are considered immediately dangerous to life and health (IDLH). Additionally, the National Institute of Occupational Safety and Health (NIOSH) and the American Conference of Governmental Industrial Hygienist (ACGIH) have established exposure limits for CO2 of 0.5% for a time weighted average over an 8-hour work day (TWA) and a short-term exposure limit (STEL) of 3% by volume averaged over a 15-minute time period. .

Additionally, the National Institute of Occupational Safety and Health (NIOSH) and the American Conference of Governmental Industrial Hygienist (ACGIH) have established exposure limits for CO<sub>2</sub> of 0.5% for a time weighted average over an 8-hour work day (TWA) and a short-term exposure limit (STEL) of 3% by volume averaged over a 15-minute time period.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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