A carbon dioxide (CO2) extinguisher causes the fire to suffocate.
Co2 removes the oxygen element from the fire triangle.
Use this fire extinguisher for class “B” and “E” fires. Never use a CO2 extinguisher for class “C” and “D” fires.
A foam extinguisher cools the fire, thus removing the heat element from the fire triangle.
Foam also prevents re-ignition by smothering the fire.
Use this fire extinguisher for class “A” and “B” fires.