Carbon dioxide extinguishing systems may be used in areas where fires could occur in:

• A. Flammable liquids and gases
• B. Rubber tire storage
• C. Paper storage
• D. Combustible metals

Answer: (A)

Carbon dioxide extinguishing systems are effective because CO2 displaces the oxygen in an enclosed space, smothering the fire. This makes them well-suited for fires involving flammable liquids and gases, where removing the flame’s oxygen source quickly stops combustion and the fuel vapors are contained. In spaces storing or using flammable liquids or gases, a CO2 release can rapidly knock down the fire after occupants have been evacuated, without leaving residue.

Other scenarios aren’t as compatible with this method. Fires involving rubber tires present a large, evolving fuel load and heat, with fuel pockets that CO2 may not reach effectively. Paper storage fires, while hazardous, typically require cooling and methods better suited to solid combustibles. Combustible metal fires require specialized agents (not CO2) and can react differently with oxygen-displacing blankets. Thus, fires involving flammable liquids and gases are the best fit for CO2 systems.