Types of: Clean Agents and Carbon Dioxide: CO₂, a clean gaseous agent which displaces oxygen. Highest rating for 7. 7 kg (20 pound) portable CO₂ extinguishers is 10B: C. Not intended for Class A fires, as the high-pressure cloud of gas can scatter burning materials. CO₂ is not suitable for use on fires containing their own oxygen source, metals or cooking media. Although it can be rather successful on a person on fire, its use should be avoided where possible as it can cause frostbite and is dangerous to use as it may displace the oxygen needed for breathing, causing suffocation. Mixtures of inert gases, including Inergen and Argonite. compressed CO₂ sprinkler is another design used to fight the electric fires with cubic cylinder of 7 cubic meter starting from 1 meter above the sprinkler level. Novec 1230 fluid (aka "dry water" or Saffire fluid), a fluoronated ketone that works by removing massive amounts of heat. Available in fixed systems in the US and in portables in Australia. Unlike other clean agents, this one has the advantage of being a liquid at atmospheric pressure, and can be discharged as a stream or a rapidly vaporizing mist, depending on application. Potassium Aerosol Particle Generator, contains a form of solid potassium and other chemicals referred to as Aerosol Forming Compounds (AFC). The AFC is activated by an electrical current or other thermodynamic exchange which causes the AFC to ignite. The Majority of installed currently are fixed units due to the possibility of harm to the user from the heat generated by the AFC generator