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It has been shown that many industries require dried, dehydrated air rather than ordinary moistureladen air. Such industries include, for example, electric generators, warehouses (especially pharmaceutical), archives, museums, libraries, agricultural, woodworking and food industries, where high moisture content causes product degeneration. In such cases, moisture is removed from the air (i.e. its drying). The article considers the main methods of air drying (heating, adsorption, condensation) and shows that the most effective and acceptable is air drying due to moisture removal by its condensation method. New device for complete drying of air by moisture condensation is presented. It is characterized by simple design providing productivity improvement. This is achieved by cooling, moisture removal and the subsequent heating of the air as it passes along one spiral-shaped duct. The lengths of the cooling and heating spirals are selected in such a way that the air passing along them completely manages to take the required temperature. Resume: