Refrigerator appliance including a fresh food chamber cold wall

A refrigerator appliance defining a vertical direction, a lateral direction, and a transverse direction, the refrigerator appliance comprising:

• a cabinet;
• a liner attached to the cabinet and defining a fresh food chamber and a freezer chamber;
• wherein a receiving space is formed between the cabinet and the liner;
• an icemaker at least partially received within the fresh food chamber;
• a cooling system comprising:
• an air supply duct in fluid communication with the icemaker and positioned within the receiving space along a first lateral side of the fresh food chamber;
• an air return duct in fluid communication with the icemaker and positioned within the receiving space along the first lateral side of the fresh food chamber;
• an evaporator positioned at the freezer chamber;
• and
• a fan configured to motivate air from the evaporator through the air supply duct and the air return duct, wherein the air return duct is in planar contact with an outer surface of the liner along the first lateral side of the fresh food chamber forming a cold wall;
• and
• a panel positioned within the fresh food chamber and adjacent to the liner opposite the air supply duct and the air return duct, wherein a gap is formed between the liner and the panel.