Oven door for a vending machine

A vending machine adapted for dispensing at least one pre-packaged food product, the vending machine comprising:

• a microwave oven including:
• a magnetron that emits microwave electromagnetic radiation;
• a housing defining a microwave cavity for receiving the food product, the housing defining a first opening to allow passage of the pre-packaged food product between outside of the microwave cavity and inside of the microwave cavity;
• 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;
• and
• a conveying system disposed at least partially exterior to the microwave cavity, the conveying system including a conveying surface for receipt of the pre-packaged food product, the conveying system configured to move the pre-packaged food product into and out of the microwave cavity, wherein the housing includes a first wall and a second wall spaced from one another that are connected by a top wall with a top wall inner surface and a third wall spaced from a fourth wall, the third wall and the fourth wall being connected by a bottom wall, wherein a vertical distance between the top wall inner surface and the conveying surface of the conveying system defines a vertical cavity height that is equal to a vertical height of the first chain door.