Air curtains are similar to fans in that they generate a blast of air. The difference with air curtains is that they force the air downward to create an invisible barrier between two spaces, such as in an entryway to a store. This barrier blocks air from flowing between the two areas.
There are two types of air curtains: Heated and unheated. Heated air curtains are ideal for those who are primarily concerned about temperature control — for example, a shopping mall that wants to prevent heat from escaping through its sliding doors during the cold winter months. They provide protection against contaminants as well (i.e. dust, insects, etc.) while offering the added benefit of heat.
Unheated air curtains are perfect for those who are mainly concerned about contamination. They are useful in sensitive areas such as hospitals, body shops and kitchens where contaminant control is a top priority. The air curtain forces air down to prevent contaminants from entering the protected area.