5.0kg Carbon Dioxide CO2 Fire ExtinguisherThe Carbon Dioxide 5. 0Kg fire extinguisher is the largest in the portable range. More commonly used fire extinguisher throughout Health and Aged Care Facilities and Major Switchrooms due to its low irritant contents. After use, the contents evaporate so there is no clean up, and no small air particles, so there is less harm to the respiratory system of patients and residents alike. Less damage to electrical equipment. Refilling available after use.