Dryers are plants that remove moisture from materials under controlled conditions. The wood adapts its moisture to the humidity of the environment, which is why the drying process is carried out by thermodynamic processing of the air. In convective dryers, air flow is achieved by axial fans that periodically change the direction of flow, while the heat exchange between air and water is being done by lamellar heat exchanger. The paper briefly describes the processes that take place during the thermodynamic processing of air in the dryer and the removal of moisture from the wood. The dimensioning of the convective dryer for sawn wood is processed in the budgetary part of the paper. Dimensioning consists of determining the dimensional characteristics of the dryer and the stockpile, the thermal calculation and the dimensioning of the dryer equipment. The dryer is projected to be a free-standing facility in prefabricated construction. Two gas condensing devices connected to three heat exchangers via a Tichelmann connection scheme were selected as the heat source. The temperature of the water circulating through the exchangers is regulated by a three-way rotary valve. The exchange of fresh and waste air takes place through six openings on the roof of the dryer.