BORDELET wood-burning fireplaces are only designed to burn logs. To obtain proper, efficient and clean combustion, you should not exceed a wood load of 11 kg. We recommend you use dry wood with maximum moisture content of 20% to optimise combustion to reduce deposits and soiling, both in the appliance itself and in the duct. High quality wood significantly reduces the release of particles into the atmosphere. The wetter the wood, the less efficient the combustion process is and the lower the efficacy of the appliance. All hardwoods produce good embers and a longer-lasting fire (hornbeam, oak, ash, birch, elm, beech). White and resinous woods with looser fibres create more flames but fewer embers, they also burn much more quickly (fir, pine, poplar and linden).