What precaution should be taken when using CO2 fire extinguishers?

When using CO2 fire extinguishers, ensuring proper ventilation is crucial because carbon dioxide can displace oxygen in the air. This means that in a confined space, the use of CO2 can lead to a reduction in the amount of breathable air available, which could create a suffocation hazard for anyone nearby. Adequate ventilation helps to ensure that there is enough oxygen for individuals in the area while still effectively suppressing the fire.

The requirement for proper ventilation reflects the unique properties of CO2 as a fire suppressant. It functions by displacing oxygen around the fire, thereby starving it of the oxygen needed for combustion. However, this same action can pose a risk to people in the vicinity, particularly in enclosed spaces. Thus, maintaining proper airflow not only aids in fire suppression but also safeguards the well-being of individuals present.