Fire ClassesFire is the result of a chemical reaction between some types of fuel and oxygen. When this reaction occurs, energy is released in the form of heat and light. For a fire to start, there must be fuel, oxygen, and a high enough temperature to start the reaction. Fires may be extinguished by removing the fuel or oxygen or by reducing the temperature to a level below that needed for the reaction.Fires are categorized by the European regulation EN3and are identified by the types of extinguishing agents best used on each type. The five categories are Classes A, B, C, D and F.•Class A fires are fuelled by solid combustible materials such as wood, paper, and cloth. These fires typically occur in aircraft cabins and cockpits, so any extinguishing agent used for Class-A fires must be safe for the occupants.•Class B fires are fuelled by combustible liquids such as gasoline, turbine- engine fuel, lubricating oil, and hydraulic fluid. Those fires occur in engine compartments.•Class Cfire
s are fueled by gases, such as propane, butane, and natural gas. These fires can occur in various settings, including kitchens and industrial areas. Extinguishing agents for Class C fires must be non-conductive to ensure safety when dealing with electrical equipment.
•Class D fires involve combustible metals, such as magnesium, titanium, and sodium. These fires require specialized extinguishing agents that can smother the flames without reacting with the burning metal. Class D fires are often found in industrial environments where these metals are processed or used.
•Class F fires are fueled by cooking oils and fats, commonly found in kitchens and restaurants. These fires require specific extinguishing agents that can effectively cool and smother the flames without spreading the fire further.
Understanding these fire classes is crucial for selecting the appropriate fire extinguishing agents and ensuring safety in various environments. Always refer to the specific guidelines and regulations for fire safety in your area.