Fire safety training is essential for anyone who may be called upon to act as a fire warden. Part of this training is understanding the different types of fires that exist. Class A fires involve solid materials such as wood, paper, rubber, plastic and cloth. Class B fires involve flammable or combustible liquids, such as petrol, oil and paint. Class C fires involve flammable gases, such as propane, butane and methane. Class D fires involve flammable metals, such as potassium, aluminium and titanium. Class F fires involve cooking oils and fats. Each type of fire requires a different approach to extinguish it, so it is crucial that fire wardens have a good understanding of fire safety procedures.