After discharging a CO2 extinguisher, what is recommended?

• A. Re-enter the room to assess for re-ignition.
• B. Wait several minutes before exiting.
• C. Exit the room quickly, especially in confined spaces.
• D. Open all doors to vent the room before leaving.

Answer: (C)

When a CO2 extinguisher is discharged, the gas quickly fills the area and displaces the surrounding oxygen. In a confined space, this can create a dangerous asphyxiation risk even if the fire is out. The priority is to get yourself out of the hazardous environment promptly so you aren’t exposed to low oxygen levels. Re-entering to check for re-ignition or lingering in the room increases the danger. After you’ve evacuated, call for help and allow responders to assess and ventilate the area if needed. Opening doors to vent is something to do if it’s safe and you’re already outside or at a safe distance, but the immediate and most important action is to exit quickly.