If an area needs to be cooled then the basic principle is to rapidly replace the warm air around the area with cooler ambient air. The continual replacement of warmed air will rapidly increase cooling. The area in question might be a cooling rack for hot product or a surface in a production line.
When selecting a compressed air enhancement product for such applications the general idea is to get and even air flow over the whole area. An uneven air flow might result in localised hot spots forming and so uneven cooling. As such the products that produce broader air flows are desirable.
Air amplifiers are a good choice for static area cooling i.e. when the product or area is fixed such as a cooling rack or hot machine surface. These products produce a large volume flow of air with a fairly gentle impact, which can be desirable when, say, cooling delicate products in a cooling rack. The broad spread of the streams from these products mean an even distribution of air flow can be achieved over large areas.