Air curtain (ventilation)

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An air curtain is a device used for separating two spaces from each other. It usually happens at the exterior entrance. The most common configuration for air curtains is a downward facing fan mounted over an opening. Normally this opening is an entrance to a building and the air curtain is intended to help keep outside air out and avoid cold draught by mixing in warm air from the air curtain. The fan must be powerful enough to generate a jet that can reach the floor.

An air (non-heated) air curtains are often used in conjunction with cold storages and refrigerated rooms. Airflow through a door depends on wind forces, temperature differences and pressure differences.

Air curtains can be used to save energy by reducing the energy transfer between two spaces, although a closed and well sealed physical door is much more effective. Or a combination can be utilized; when the door is opened air curtain turns on, minimizing air flow from inside to outside and vice versa.