Abstract: A system comprises a display unit and shelves. The display unit has an open front chamber for storing food products, a lower air duct with a lower front inlet, an upper air duct with an upper front outlet, a fan and an air refrigerator. The upper front outlet is directed at the lower front inlet for creating an air curtain in front of the open front. At least one of the shelves is a hollow shelf with an inner space, a shelf air outlet at a front side, a shelf air inlet at a back side, a fan, and a shelf heater. The fan is in fluid connection with the shelf air inlet and the shelf air outlet for moving air from the shelf air inlet through the hollow shelf to the shelf air outlet.

Abstract: A system 1001 comprises a display unit 1002 and shelves 4. The display unit has an open front chamber 50 for storing food products, lower and upper air ducts 32, 34, a fan 36, and an air refrigerator 44. At least one wall is transparent. The display unit further comprises a conduit wall 88, parallel to the transparent wall for creating an air conduit 90. The air conduit comprises a first conduit inlet 92, a second conduit inlet 94, and a conduit outlet 96. The first conduit inlet is in fluid connection with one of the lower and upper air ducts for diverting a portion of the air moving through the relevant air duct into the air conduit. The second conduit inlet is in fluid connection with ambient air outside of the display unit.

Abstract: A system 1001 comprises a display unit 1002 and shelves 4. The display unit has an open front chamber 50 for storing food products, lower and upper air ducts 32, 34, a fan 36, and an air refrigerator 44. At least one wall is transparent. The display unit further comprises a conduit wall 88, parallel to the transparent wall for creating an air conduit 90. The air conduit comprises a first conduit inlet 92, a second conduit inlet 94, and a conduit outlet 96. The first conduit inlet is in fluid connection with one of the lower and upper air ducts for diverting a portion of the air moving through the relevant air duct into the air conduit. The second conduit inlet is in fluid connection with ambient air outside of the display unit.

Abstract: A system comprises a display unit and shelves. The display unit has an open front chamber for storing food products, a lower air duct with a lower front inlet, an upper air duct with an upper front outlet, a fan and an air refrigerator. The upper front outlet is directed at the lower front inlet for creating an air curtain in front of the open front. At least one of the shelves is a hollow shelf with an inner space, a shelf air outlet at a front side, a shelf air inlet at a back side, a fan, and a shelf heater. The fan is in fluid connection with the shelf air inlet and the shelf air outlet for moving air from the shelf air inlet through the hollow shelf to the shelf air outlet.