Fire extinguishers are active fire protection tools used to extinguish or control small fires, generally in emergency situations. Fire extinguishers are not designed for use in uncontrolled fires, for example when the fire has burned the ceiling. Generally a fire extinguisher consists of a high pressure tube containing a fire extinguisher.There are two main types of fire extinguishers: internal pressurized and cartridge operated. In the internal pressurized unit, the exhaust gas is stored in the same chamber as the fire extinguishing agent. Depending on the material used, if different, the driving material used will also be different. In dry chemical extinguishers, nitrogen is generally used; water and foam extinguishers usually use air. A pressurized internal fire extinguisher is the most common type. Whereas the type of extinguisher operated by the spraying gas cartridge contains in a separate cartridge which must be pressed first before flowing out, pushing the extinguishing material.This type is not as common, used mainly for industrial facilities, where it requires a use with a higher capability than usual. and has the advantage of being simpler so that it allows the user to quickly extinguish, so as to be able to control the fire in a fast period of time. Unlike the internal pressurized type which uses nitrogen, this extinguisher uses a carbon dioxide boost instead of nitrogen, although nitrogen cartridge models are also sometimes used at low temperatures.Cartridge-operated extinguishers used worldwide are available in dry chemical and dry powder types as well as wet ingredients such as water, foam, dry chemical (class ABC and BC), and dry powder (class D).
