Abstract: A multi-band air curtain forms a separation barrier at an interface between a first environment having a fluid at a first condition and a second environment having a fluid at a second condition. A first stream (55) of a fluid is directed along a first path (45) generally parallel to the interface between the first environment and the second environment. A second stream (65) of fluid is directed along a second path (75) generally outwardly at an angle of divergence with the first path (45). A third stream (65) of a fluid is directed along a third path (95) between the first path (45) and the second path (75) at a first interior angle with said first path (45) and at a second interior angle with said second path (75).

Abstract: A refrigerated merchandiser includes a display case defining a product display region having an open-front isolated from the ambient air of the store by means of a downwardly directed inner air curtain of relatively cold refrigerated air and a downwardly directed outer air curtain of relatively warmer air. The inner air curtain discharges through a first air outlet at a first discharge velocity and the outer air curtain discharges through a second air outlet at a second discharge velocity, the second discharge velocity being at least about 1.4 times greater than the first discharge velocity, and most advantageously, from about 1.4 to about 1.8 times greater than the first discharge velocity.

Abstract: A refrigerated merchandizer includes a display case defining a product display region having an open-front isolated from the ambient air of the store by means of a downwardly directed inner air curtain of relatively cold refrigerated air and a downwardly directed outer air curtain of relatively warmer air. The outer curtain of relatively warmer air is directed downwardly and outwardly away from the inner air curtain of relatively cold air at a divergent angle with respect to the inner air curtain.