Abstract: A vending machine adapted for dispensing at least one pre-packaged food product includes a microwave oven. The microwave oven includes a magnetron that emits microwave electromagnetic radiation, a housing that defines a microwave cavity for receiving the food product. The housing defines a first opening to allow passage of the pre-packaged food product between outside of the microwave cavity and inside of the microwave cavity. The microwave oven also includes a first chain door that selectively covers the first opening so as to prevent the microwave electromagnetic radiation from escaping the housing through the first opening.