Fire blankets are used to extinguish fires in kitchens (cooking oil, fat pans, waste bins ect) and clothing fires.
Covering with a fire blanket cuts the supply of oxygen to the contents of a pan or a person’s clothing. Before using a fire blanket you have to judge if It is safe to fight the fire. That will depend on whether the blanket is big enough to cover the full area of the fire and therefore cut off the Oxygen supply to the flames. Ignis Fire Safety can supply/advise on correct size.