The need to keep external air draughts from entering open industrial doorways has existed for some time and has now been met with success. Experience and technical advancements in this area have led to a most effective means of controlling unnecessary losses in heat dispersion. One of the most damning factors in providing a pleasant working environment is without doubt the infiltration of cold air draughts. This problem represents a constant health risk to personnel while at the same time compromising their productivity. However, the advantages that come with the installation of CARLIEUKLIMA air barriers are many. The air barrier blocks out cold air infiltration, thus allowing work to be carried out in areas adjacent to doorways and protecting personnel from exposure to cold related illnesses. By blocking out cold air draughts, the air barriers are able to maintain the desired ambience temperature throughout the work place area, even in proximity to doorways and entrances, thus maximizing usage of the total floor space area. As well as blocking out cold air, this invisible barrier also helps to break up internal air layers and so provide a more even dispersion of heat within the building. The heat loss due to cold air infiltration is considerable but difficult to quantify, due to many contributing factors; however, we can say with certainty that the EUWIND air barrier system will drastically reduce heat loss to the extent that its initial investment cost will be recuperated in less than two seasons of operation.