Air Curtains

Air Curtain Fundamentals:

Air curtains create a laminar airflow that is projected over the opening of a doorway. This "curtain" of air acts as an invisible barrier that won't let air flow through it. Cool and conditioned air from the inside of the door is diverted back inside when it hits the wall of air. The air seal also keeps the outside air from entering. You can lower your energy costs, keep unwanted pests out, and maintain a sanitary work area.

An air curtain is most often used to separate one environment from another. Typically, the air curtain is mounted over a doorway on the inside, as a result, the air pulled into the intake of the unit is from the conditioned environment. This air is accelerated and forced through a narrow discharge along the length of the air curtain creating a laminar airflow. The discharge angle can be adjusted using the provided turning vanes to achieve optimum performance. As the discharge angle increases, the air has to travel further until it hits the floor. Since the velocity of the air decreases as it gets further away from the air curtain, if the discharge angle is too large the aire curtain won't be able to stop much wind from entering near the floor. If the discharge angle is too small, the air leaving the unit will not have enough horizontal force to stop a significant gust of wind from entering. Usually the ideal discharge angle for maximum wind-stopping capability is around fifteen degrees.

Comparison to Other Air Curtains
  • Traditional Air Curtains
  • ESS Group Air Curtains

When the discharged air reaches the floor it splits, forcing some air outward and some inward. This is why when a unit is used for climate control, it should be placed on the opposite side of the doorway from that of the air that is to be kept out. For example, if it is winter and you are trying to keep cold outside air from entering a building, the aire curtain would be placed on the inside so that it is blowing warm air. When the warm air hits the floor, some is leaked to the outside and some is blown back inside. If the unit was on the other side of the opening, some of the cold air that you are trying to keep out would be blown inside, defeating the purpose. If the unit is to be used for insect control, the aire curtain can be mounted on the outside of the doorway as long as the discharge is adjusted so the air is blowing back toward the outside. In this situation it doesn't matter if some of the outside air is blown inside after it splits at the floor. This air should already be free of insects because they will not fit through the intake screen.