Air tower with heat trap compartment for top mount freezer refrigerator

A refrigeration appliance comprising:

• a freezer compartment;
• a fresh food compartment;
• a refrigeration system, including an evaporator;
• an evaporator cover positioned between said evaporator and said freezer compartments having a first passage for discharging air cooled by the evaporator;
• a defrost heater associated with said evaporator;
• an air tower attached to said evaporator cover receiving cooled air discharged from the evaporator through said first passage, said air tower having
• a diffuser section overlying said first passage and having a plurality of vent outlets positioned in said freezer compartment for directing cooled air into said freezer compartment,
• a central vertical duct section defined by substantially vertical walls comprising a front wall and first and second side walls extending from said diffuser section for directing cooled air toward said fresh food compartment,
• an outlet at an end of said central vertical duct section opposite said diffuser section to communicate with said fresh food compartment, and
• a first heat trap compartment formed along said first side wall defining said central vertical duct section comprising a first additional wall spaced from said first side wall and connected to said first side wall at a first and second end forming a first enclosed space on the exterior of said central vertical duct section on said first side wall,
• wherein said evaporator cover has at least one second passage therethrough in a region corresponding to said first heat trap compartment to allow heat to flow into the first heat trap compartment from the defrost heater.