Only use dry wood for heating. It burns well and has the best thermal efficiency. If the wood is damp, its burning temperature decreases, the efficiency of the fireplace is reduced and the particle emissions increase. The moisture vaporised from wet wood can also condense on the surface of the smoke ducts, which reduces draught.
For example, you must burn roughly 40% more alder compared to birch.
The firewood is dried by storing fresh, split wood in an airy place protected from rain. The drying times of different types of wood vary. You can identify dry wood by the clear clanging sound heard when hitting two logs together. Bring the firewood inside at least two days before use.
Do not burn impregnated wood, chipboard, juice boxes or magazines, for example. They release substances that are harmful to the fireplace and the environment.