Used air curtains are designed to separate two spaces from each other usually at the exterior entrance. The most common set up for air curtains is a downward facing blower fan mounted over an opening, blowing air down and outward across the lower surface providing an air barrier. Air curtains can come with a heater to heat the air. Normally the opening is an entrance to a building, or opening between two spaces conditioned at different temperatures. Air curtains work with the internal air flow to keep the insects, the dirt and dust outside and the cold or hot air in. Contact one of our technicians to get all the details on using and installing air curtains. ASI guarantees you will be satisfied.