Abstract: The portable fire extinguisher has a housing, a pair of nozzles protruding from the housing, and a heat-responsive valve mounted outside the housing for detecting high heat intensity at proximity of the housing. The housing contains a cylinder of inert gas under pressure, a reservoir of fire suppressant material, and a piping system connecting the cylinder of inert gas, the heat-responsive valve, and the reservoir of fire suppressant material to the nozzles. The housing has a carrying handle formed thereon and magnets on surfaces thereof for retaining the housing to a range hood in a detachable manner. The piping system comprises a manual valve mounted in parallel with the heat-responsive valve for selective operation of the fire extinguisher in a manual mode. The heat-responsive valve is mounted near the top surface of the housing for detecting high heat intensity as close as possible from the ceiling of a range hood.