Air Curtain

An air door or air curtain is a device used to prevent air or contaminants from moving from one open space to another. The most common use is a downward-facing blower fan mounted over an entrance to a building, or an opening between two spaces conditioned at different temperatures. Air curtain also saves energy acting as an invisible door/barrier between cold air inside the room and reducing temperature loss or load to air condition unit due to door opening.