Air duct for refrigeration case

A refrigeration case comprising:

• a housing including a top wall and a rear wall, the housing defining an interior chamber;
• a door movably coupled to the housing opposite the rear wall, the door operable to selectively open and close the interior chamber;
• a fan for providing cool air flow;
• a shelf positioned within the interior chamber proximate the top wall, the shelf including a front end proximate the door and a rear end positioned away from the door;
• a flow channel having an inlet in fluid communication with the fan, the flow channel circulating air flow within the interior chamber;
• a return duct positioned above the shelf and including a first portion and a second portion, the first portion including a first return opening in fluid communication with the fan and positioned proximate the front end of the shelf, the second portion including a second opening in fluid communication with the fan and positioned proximate the rear end of the shelf

A refrigeration case comprising:

• a housing including a top wall and a rear wall, the housing defining an interior chamber having an upper portion and a lower portion;
• a door movably coupled to the housing opposite the rear wall, the door operable to selectively open and close the interior chamber;
• a first shelf positioned proximate the lower portion of the interior chamber;
• a second shelf positioned above the first shelf;
• a third shelf positioned above the second shelf;
• a fan for providing cool air flow, the fan positioned proximate the top wall;
• a duct wall positioned proximate the rear wall and at least partially defining a flow channel extending between at least the first shelf and the second shelf, the duct wall including a first opening proximate the first shelf and a second opening proximate the second shelf;
• a diverter positioned in the flow channel proximate the second shelf, the diverter directing air flow through the second opening and over the second shelf;
• and
• a return duct positioned above the third shelf, the return duct including a first return opening and a second return opening, the first return opening in fluid communication with the fan and positioned proximate a front end of the shelf, the second opening in fluid communication with the fan and positioned proximate the rear end of the shelf