Abstract: A sawn wood drying system, which allows to take advantage of the heat contained in the dry wood that leaves the system to preheat the wet and cold wood that enters the system, the system comprising: a heating chamber, a drying chamber and a cooling chamber, sequentially arranged, and a transport path that allows the transfer of sawn wood through these three chambers; a first air circulation system, which provides a first high temperature air flow inside the drying chamber; and a second air circulation system that provides a second air flow, independent of the first air flow, which allows the heating chamber to be in fluid communication with the cooling chamber by means of external chambers or ducts connecting both chambers.

Abstract: A ventilation assembly is defined comprising a fan located in the top of a drying chamber or furnace and which recirculates gases at high temperatures and/or humidity; a drive shaft with its mounts or bearings, on which is mounted the fan, and a separation chamber which houses the shaft bearings and separates said bearings from the inside of the drying chamber or furnace. The separation chamber is open to the external environment and is sized such that a person may enter it to perform maintenance of the shaft bearings without the need to enter the dryer or furnace. The ventilation assembly may further include the pre-assembly in the factory of the engine, its transmission system and/or one or more air renewal vents. Furthermore, the assembly can be complemented with trusses to further facilitate installation on the walls of the dryer or furnace.