Abstract: An improvement in refrigerated display cabinets in which barrier doors and one or more guard air bands protect the primary refrigerated air band which is circulated within the cabinets during time periods when the barrier door is opened. The cabinets may be equipped with air defrost systems. When two guard air bands are employed, the outermost of these is directed across the outside surface of the barrier door. The air defrost system can incorporate a door opening mechanism which provides a gap between the barrier door and the access opening in order to permit ambient air through-flow for defrost purposes.Control circuitry can be controlled by opening of the barrier doors in order to actuate the guard air band movement.

Abstract: An open well type refrigerated display case for low temperature application having reverse flow of refrigerated air access the access opening in the top of the display case to produce the lowest temperatures toward the front of the display case. Multiple horizontal air bands are circulated across the opening provided in the top of the display case to dissipate radiant heat impinging on the product displayed in the case, with the inner air band being refrigerated and the outer air band being partially refrigerated and dehumidified. Dehumidification of the outer air band is achieved by aluminum fins provided in a lower portion of the duct work which conducts the outer air band.