What is one limitation of using CO2 as an extinguishing agent?

Using CO2 as an extinguishing agent does present a limitation in that it can lead to a reflash, which occurs when the fire re-ignites after it has been extinguished. This happens because CO2 is effective primarily due to its ability to displace oxygen around the fire, interrupting the combustion process. However, when the CO2 disperses after use, the oxygen levels can return, allowing for a possible re-ignition of any remaining hot materials or embers, especially if the area is not adequately cooled or if flammable materials are present.

This limitation emphasizes the importance of ensuring that the area involved is truly safe after using CO2 as an extinguishing agent. Additional measures, such as cooling the area or monitoring for potential fire flare-ups, may be necessary to prevent reflash. Understanding this risk is crucial when selecting a fire extinguishing method and planning for fire safety.