Are suitable for use with fires involving burning oil and deep fat fryers (Class F fires). These extinguishers come with a special application lance which lays a cooling layer of foam on top of the burning oil. Alternatively a fire blanket can be placed over the pan containing the burning oil. The pan should then be left to cool down.
NEVER carry the pan outside or lift the fire blanket after a short period of time to inspect the burning oil as introducing oxygen through this action could reignite the fire.
NEVER use pressurised water, powder or foam extinguisher on fires involving burning oils as the pressurised jet will cause the burning oil to be carried out of the pan onto surrounding surfaces causing more damage and a larger fire to tackle.