TECHNICAL FEATURES. The EUWIND air barrier is installed inside or outside the building, on one or both sides of the entrance door to be shielded. The ventilation column includes:
. An air intake protected from external contamination
. An upper silencer
. One or more axial fans
. A lower silencer
. A metallic joint
. A ground level channel with angled slits for the expulsion of air.
The fan extracts warm air from near the ceiling and pushes it through the silencers in the distribution channel and then through the slit at considerable speed. This jet of air cuts and lifts the layer of cold air at ground level and expels it to the outside of the building, leaving warmer air on the inside. The EUWIND air barrier has the advantage of maximum efficiency at ground level, where the incidence of cold air is much higher.

FACTORS BEARING ON THE SYSTEM SETTING. The aim of the air buffer is to block out cold air draughts from entering at doorways. These draughts are determined by differences between indoor and outdoor air pressure, due mainly to:
. Extraction of air from the building [extractor fans, ventilators, etc.]
. Differences in internal and external temperature
. Wind pressure on the entrance area.
The air barrier is designed, taking into account a nominal difference in pressure of 8-10 Pa between the inside and outside.