What is NOT a characteristic of carbon dioxide fire-extinguishing agents?
Official USCG Answer & Rule Citation
Correct Answer: Option A — Effective even if ventilation is not shut down
Effective CO2 fire suppression requires enclosed spaces where the gas concentration can reach 30 to 50 percent to displace oxygen. If ventilation is not shut down, fresh oxygen continuously enters, diluting the extinguishing concentration and allowing the fire to reignite.
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