Foam fire extinguishers are ideal for multi-risk situations where both class A and B risks exist. Class B fires, those involving flammable liquids, such as petrol, diesel, spirits, solvents and lubricants, can be tackled very effectively. The extinguishers, contain an aqueous film forming foam which gives rapid flame knock-down and has a blanketing effect, smothering the flames and sealing vapours to prevent re-ignition.