C02 as a clean fire extinguishing media, suitable for use in high-voltage electricity above 12 000 volts, because the non-conductive, less effective for the class B and is not effective in Class A.
C02 is a cool gas and reduce the oxygen content around the fire, and after use C02 or not leave rust stains.

There are various sizes, from portable s / d Trolley ( with wheels) size 50 kg.