Air curtain (ventilation)

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An air curtain is a device used for separating two spaces from each other. 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 and flying insects out. The fan must be powerful enough to have a high velocity air jet reach the floor.

An air curtain may also incorporate heating (electric or hot water) and/or cooling devices. Ambient (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.