Abstract: In a heater system for a microwave oven including an air tunnel having an suction portion and a discharge portion, formed at an upper surface of a cooking chamber, a fan assembly installed inside the air tunnel and having a circulation fan forming air flow by sucking air inside the cooking chamber through the suction portion and discharge the sucked air through the air tunnel and the discharge portion, a first heater chamber having a first heater installed inside the air tunnel and heating air discharged into the discharge portion from the air tunnel, and a second heater chamber having a second heater installed inside the air tunnel and emitting radiation heat into the cooking chamber, wherein the suction portion and the discharge portion are formed near opposite side walls of the cooking chamber.

Abstract: In a heater system for a microwave oven including an air tunnel having an suction portion and a discharge portion, formed at an upper surface of a cooking chamber, a fan assembly installed inside the air tunnel and having a circulation fan forming air flow by sucking air inside the cooking chamber through the suction portion and discharge the sucked air through the air tunnel and the discharge portion, a first heater chamber having a first heater installed inside the air tunnel and heating air discharged into the discharge portion from the air tunnel, and a second heater chamber having a second heater installed inside the air tunnel and emitting radiation heat into the cooking chamber, wherein the suction portion and the discharge portion are respectively formed at each end portions of the upper surface of the cooking chamber, said end portions facing each other and positioned toward the side walls of the cooking chamber.