Firewood must comply with the standards and regulations in force and meet the following conditions:
• 1 meter long;
• split or round;
• hardwood: acacia, oak, beech, hornbeam or elm;
• humidity between 10% and 20%;
• free of rot or other defects that affect quality;
• cut to a length of 1 m and stacked for measurement at a height of 2 m.