A Portable CO2 Fire Extinguisher is a common fire suppression device because carbon dioxide is blasted and safely eliminates flames involving electrical equipment and flammable liquids. CO2 is non-damaging and clean making it perfect for indoor fire suppression. The carbon dioxide (CO 2) fire extinguisher is a portable, active fire protection device that works by expelling carbon dioxide onto a fire. It works by displacing the oxygen the fire relies upon to continue burning. Portable CO2 Fire Extinguisher is very efficient.