Combination drain system for multizone oven

A multi-cavity oven comprising:

• a housing defining an interior volume subdivided by horizontally extending thermal barriers into multiple cooking cavities including a lowermost cooking cavity and at least one upper cooking cavity, each cooking cavity supporting different cooking temperatures and humidities, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;
• a drain port extending laterally through a vertical wall of each of the at least one upper cooking cavity to conduct liquid received at an upper surface of the thermal barrier out of the at least one upper cooking cavity;
• a lower drain to conduct liquid received at a bottom wall of the lowermost cooking cavity out of the lowermost cooking cavity;
• a set of fans circulating steam independently through the cooking cavities in isolation from the other cooking cavities;
• an air outlet extending from each cooking cavity to conduct the steam out of each cooking cavity to ambient air;
• wherein each drain port is separated from the other drain ports and the lower drain by at least one backflow limiter being at least one pool of water blocking the free flow of gas into and out of the respective cavities.

A multi-cavity oven comprising:

• a housing defining an interior volume subdivided by horizontally extending thermal barriers into multiple cooking cavities including a lowermost cooking cavity and at least one upper cooking cavity, each cooking cavity supporting different cooking temperatures and humidities, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;
• a drain port extending laterally through a vertical wall of each of the at least one upper cooking cavity to conduct liquid received at an upper surface of the thermal barrier out of the at least one upper cooking cavity;
• a lower drain to conduct liquid received at a bottom wall of the lowermost cooking cavity out of the lowermost cooking cavity;
• a set of fans circulating steam independently through the cooking cavities in isolation from the other cooking cavities;
• an air outlet extending from each cooking cavity to conduct the steam out of each cooking cavity to ambient air;
• upper and lower jet plates positioned above and below each cavity, the upper and lower jet plates providing separate upwardly and downwardly projecting air jets respectively communicating with a common fan of each cooking cavity;
• wherein each drain port is separated from the other drain ports and the lower drain by at least one backflow limiter being at least one pool of water blocking the free flow of gas into and out of the respective cavities.

A multi-cavity oven comprising:

• a housing defining an interior volume subdivided by horizontally extending thermal barriers into multiple cooking cavities including a lowermost cooking cavity and at least one upper cooking cavity, each cooking cavity supporting different cooking temperatures, the interior volume surrounded by insulated outer walls and at least one door that may open and close to provide access to the interior volume;
• a drain port extending laterally through a vertical wall of each of the at least one upper cooking cavity to conduct liquid received at an upper surface of the thermal barrier to the drain port;
• a set of fans circulating air independently through the cooking cavities in isolation from the other cooking cavities;
• and
• upper and lower jet plates positioned above and below each cavity, the upper and lower jet plates providing separate upwardly and downwardly projecting air jets respectively communicating with different fans wherein the lower jet plate is sized to provide a channel between vertical walls of the oven volume and the lower jet plate along an upper surface of a lower wall of the cavity to the drain port.