Fire extinguishers (Class F)

 Class F fire extinguishers are specifically designed to tackle fires caused by cooking oils and fats, which burn at very high temperatures and can’t be safely extinguished with water or standard extinguishers. Here’s how they work:

1. Specialized Extinguishing Agent:

 Class F extinguishers contain a chemical solution that creates a fine mist. This agent is typically potassium-based, which reacts with hot oils and fats to form a soapy layer.

2. Saponification Process: 

The potassium agent in the mist interacts with the burning oils, producing a chemical reaction called saponification. This reaction forms a foam-like, soapy substance that smothers the flames and cools the oil, cutting off oxygen and cooling the area.

3. Fine Mist Cooling: 

The mist cools the hot oil without causing splashing, which is crucial for safety. Splashing would spread the fire, so the controlled misting prevents this while safely lowering the temperature.

4. Targeted Application: 

The nozzle and hose on a Class F extinguisher allow users to aim the mist precisely, ensuring the burning oil is covered and reducing the risk of reignition.

Using a Class F extinguisher is simple but effective, making it ideal for kitchens and other environments with high fire risks from oils and fats.

Fire Extinguisher (A and B)

 Foam extinguishers are commonly used for Class A and B fires. Here's how they work for each class:

1. Class A Fires: 

These involve solid materials such as wood, paper, or textiles. Foam extinguishers work by cooling the fire and creating a barrier between the fuel and the oxygen, which helps to suppress and extinguish the fire.

2.Class B Fires:

 These involve flammable liquids such as petrol, oil, or paints. Foam extinguishers form a thick layer of foam on the surface of the burning liquid, cutting off the oxygen supply and preventing re-ignition. The foam also cools the fuel to help extinguish the fire.

However, foam extinguishers are not suitable for Class C (gas) or Class D (metal) fires, and they should never be used on live electrical equipment unless they are specifically marked as safe for electrical fires.