Category B fires are fires caused by kerosene, diesel, methanol, ethanol, etc. Category C fires are fires caused by gas, natural gas, methane, ethane, propane, etc., and Category E fires are fires in which objects are electrically charged and burn, and can be used to extinguish fires such as those in books, archives, and valuable equipment.
The cooling method is to spray the extinguishing agent directly onto the burning object to reduce the burning temperature of the object, and below the ignition point, to achieve the purpose of combustion to stop, this way is generally applicable to carbon dioxide fire extinguishers or water, belonging to the physical way of extinguishing the fire, but also to avoid the formation of a new fire flame heat radiation.