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Fire classification: Based on the type of combustible material and its burning characteristics, fires are classified into six categories: A, B, C, D, E, and F. Class A fire: refers to fires involving solid materials. This substance usually has the properties of organic matter and generally produces hot embers when burned. Such as fires involving wood, coal, cotton, wool, linen, paper, etc. Class B fires: refer to fires involving liquids or fusible solid materials. Fires involving kerosene, diesel, crude oil, methanol, ethanol, asphalt, paraffin, etc. Class C fire: refers to gas fires. Such as fires involving gas, natural gas, methane, ethane, propane, hydrogen, etc. Class D fire: refers to fires involving metals. Such as fires involving potassium, sodium, magnesium, aluminum-magnesium alloys, etc. Class E fire: Fire involving electrical current. A fire in which an object burns due to being charged. Class F fire: Fires involving cooking materials in cooking appliances (such as animal and vegetable fats). Fire severity is divided into four levels: extremely serious fires, serious fires, relatively large fires, and ordinary fires. Ⅰ Extraordinarily serious fires: refer to fires that result in 30 or more deaths, or 100 or more severe injuries, or direct property losses of over 100 million yuan. Ⅱ Major fire: Refers to a fire that results in 10 to 30 deaths, or 50 to 100 serious injuries, or direct property losses ranging from 50 million yuan to 100 million yuan. Ⅲ Major fires: Refer to fires that result in 3 to 10 deaths, or 10 to 50 serious injuries, or direct property losses ranging from 10 million to 50 million yuan. Ⅳ General fires: Refer to fires that result in 3 or fewer deaths, 10 or fewer serious injuries, or direct property losses of less than 10 million yuan.