Abstract: Fire extinguishers include portions formed of heat fusible material that contain powderized fire extinguishing material. The heat fusible material releases the fire extinguishing material upon exposure to predetermined temperatures, and is preferably self-extinguishing. Such extinguishers may contain collection layers which collect the heat fusible material during a fire in order to minimize future gratuitous untidiness otherwise caused by coagulated heat fusible material on floors, furniture, and other surfaces. The extinguishers may conveniently be formed in panels which may supplant SHEETROCK.RTM. or ceiling panels, and thus escape notice of the casual observer. Similarly, a collar according to the present invention may be placed around the flue of a kitchen ventilator and effectively fight fire but remain out of sight.