Non-recirculating types of air curtains are more widely used than the recirculating type because they are easier and less expensive to install and have lower maintenance costs. The height, width, and physical characteristics of the opening will indicate if the air curtain can be mounted horizontally above the door or vertically on one or both sides of the door. A horizontal mounting above the door minimizes the chances of damaging the air curtain. Use caution when mounting a unit vertically.
Recirculating air curtains are typically used in places with constant foot traffic such as supermarkets and store entrances. Berner’s recirculating air curtains are called Air Entrance Systems, as they are built into the entrance, usually when the entrance is being constructed. They emit air from a discharge grille on one side of the door opening, collect it through a receiving grille on the opposite side and returning it through duct-work to the discharge grille. The non-obtrusive wide stream of low-velocity air created by recirculating air curtains is more desirable for separating environments.
To learn more about air curtains, take the free AEC Daily continuing education course online: “Air Curtains: Energy Savings & Occupant Comfort.”