What is kiln drying and why is it good?
Trees have plenty of water inside while growing, excess moisture is removed from timber during the kiln drying process. There might be around 80% moisture content in the timber originally. It must be dried down well below 20% in order to use for fuel safely. Theoretically it is possible to season or air-dry Logs in a shed but it would take 2-3 years get moisture down below 20% in the core of the log. Kiln drying allows you to undertake this process in 4-5 days using special kiln ovens where temperature is controlled at the optimum level.