Abstract: A device for generating an air wall in an upright refrigerated cabinet (22) comprises a primary blower slit for generating a primary air stream (30) in the frontal opening (34) of the upright refrigerated cabinet which forms a thermal separation between the low inside temperature and the ambient air of a higher temperature. No mixing occurs between the primary air stream (30) and the secondary, optionally forced air streams (1, 9) added thereto. The thereby realized great effective heat resistance achieves that the supply of heat from the ambient air to the interior space of the refrigerated cabinet is considerably limited.

Abstract: A device for generating an air wall comprises a primary blower slit for generating a flat primary air stream in a passage opening mutually separating two spaces with different temperatures. Two adjacent air streams with the same direction and speed are added to the primary air stream. The primary air stream has a temperature between those of the secondary air streams. The absolute humidity of the air of the primary air stream is at least equal to that of the cold secondary air stream and lower than that of the warm secondary air stream. The air speed of the primary air stream amounts to at least 15 m/s. The width of the primary blower slit lies in the range of 15-40 mm. The length of the primary blower slit in the direction of the air stream lies roughly in the range of 5-40 cm, preferably 10-30 cm.