Your five-part guide to fire extinguishers - part 5
There are 5 main fire extinguisher types – Water, Foam, Dry Powder, CO2 and Wet Chemical. You should have the right types of fire extinguisher for your premises, or you may not meet current regulations.
There are six classes of fire: Class A, Class B, Class C, Class D, ‘Electrical’, and Class F.
Class A fires – combustible materials: caused by flammable solids, such as wood, paper, and fabric
Class B fires – flammable liquids: such as petrol, turpentine or paint
Class C fires – flammable gases: like hydrogen, butane or methane
Class D fires – combustible metals: chemicals such as magnesium, aluminum or potassium
Electrical fires – electrical equipment: once the electrical item is removed, the fire changes class
Class F fires – cooking oils: typically a chip-pan fire
In this part of your five-part guide, we will be looking at Wet Chemical Extinguishers.
Wet chemical extinguishers are designed for use on Class F fires, involving cooking oils and fats. They can also be used on Class A fires although it is more usual to have a foam or water extinguisher for this type of fire risk.
Label Colour: Yellow
• Cooking oil/fat fires
• Organic materials such as:
• Paper and cardboard
• Fabrics and textiles
• Wood and coal
Do not use for:
• Flammable liquid or gas fires
• Electrical fires
• Flammable metals
How wet chemical extinguishers work:
Wet chemical extinguishers create a layer of foam on the surface of the burning oil or fat, preventing oxygen from fuelling the fire any further. The spray also has a cooling effect.
Types of premises/business who may need CO2 extinguishers:
• Commercial kitchens
Where to locate CO2 extinguishers:
• Place near to the source of the fire risk