A carbon dioxide extinguisher's principle means of discharge is which option?

• A. Stored pressure
• B. Cartridge operated
• C. Manual release
• D. Venturi discharge

Answer: (A)

Discharging a carbon dioxide extinguisher relies on stored pressure. The CO2 is kept in the cylinder at high pressure, ready to be released. When you squeeze the handle, the valve opens and the pressurized gas is expelled through the nozzle as a cold, dense jet, displacing the surrounding air to suppress the fire. This pressurized-release mechanism is the defining way CO2 extinguishers operate. Some CO2 units design variations use a cartridge to help create pressure, but the basic discharge principle remains releasing pressurized gas from the cylinder. Venturi discharge or simply manual release do not describe how the carbon dioxide itself leaves the extinguisher.