Clean agent and CO2 systems

Special hazard systems

OSHA 1910.160(b)(7) requires the agent containers of refillable systems to be weighed or pressure checked at least twice a year, with maintenance if losses exceed set limits.

Where a fixed system uses an agent at concentrations hazardous to people, OSHA 1910.160(b)(5) requires warning or caution signs at the entrance to and inside the protected area.

OSHA 1910.162(b)(5) requires a distinctive alarm before discharge when the gas concentration will exceed the safe level for people, so occupants can get out.

OSHA 1910.162(b)(4) requires gaseous systems to reach their design concentration within 30 seconds of discharge, or 10 seconds for Halon.

The U.S. EPA warns that at concentrations above 17 percent, which occur when CO2 systems discharge, carbon dioxide causes unconsciousness and death within a minute.

EPA describes special hazards as the share of fire protection that needs an agent other than water sprinklers, such as carbon dioxide, halon replacements or chemicals.

Extinguisher maker Amerex explains in its data center brochure that clean agents are non-conductive gases that leave no residue on electronics.

Sources: Annual inspection of fixed systems; Pre-discharge alarm; CO2 flooding can kill; Why server rooms use clean agents