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