The induction cooker used in the kitchen after catering is considered as the key fire-fighting part. There are fire-prone parts in key fire-fighting parts. Such as chemical production workshops, painting, baking, boiling, carpentry, electric welding and gas cutting operation rooms, laboratories, garages, chemical dangerous goods warehouses, flammable and combustible liquid storage tanks, flammable and combustion-supporting gas steel cylinder warehouses and storage tanks, liquefied petroleum gas cylinders or storage tanks, oxygen stations, acetylene stations, hydrogen stations, flammable buildings, etc.