In the timber industry, the most widespread drying technology
is the conventional kiln. This comprises a specialpurpose
room, the drying chamber, fitted with overhead
fans for circulating the air and heating coils for maintaining
the air (and thus the wood) temperature at the set levels.
The moisture in the air is controlled by means of vents in
the kiln’s roof, which governs the amount of moist air that
returns to the fans to be mixed with fresh air and
re-circulated.[2]