A type of extinguisher, where the extinguishing agent is liquefied carbon dioxide (CO2). They are used to extinguish group B fires. They are particularly useful where the use of extinguishing powders is not advisable due to the presence of devices sensitive to dust and all kinds of dirt, e.g.: in paint shops, power industry and industrial halls. They leave no traces of the extinguishing agent, but are less effective than other extinguishers of similar weight. The extinguishing action consists in reducing the percentage concentration of oxygen in the air, but also in significantly reducing the temperature. For this reason, when using snow extinguishers, special attention should be paid to exposed parts of the body, as they may become frostbite. This is also why people should not be extinguished with these extinguishers.