There is a large and fresh wood chips moisture is relatively high. Approximately 50% effective in burning, it is not very complete. Therefore, may need to add the sub process and reduces moisture content prior to burning.
If it is a large piece of wood and a relatively high humidity of about 50% efficiency in the combustion chamber is not perfect. So might have to increase metabolism and reduce moisture prior to combustion.
A large and if a fresh fragments have relatively high humidity, about 50% efficiency of burning is not complete. So may have to add sub process and reduce moisture before it burned.