Solid fuel - hardwood firewood

Firewood processed into steres must have knots trimmed flush with the wood surface.
Deliveries of stumps, branches, or bark are not accepted.
Firewood ends must be saw-cut, except for natural breaks and the end originating from the stump.

Firewood processed into steres with a thickness of 16–25 cm must be split in two; pieces 26–40 cm thick must be split into four approximately equal parts; and pieces over 40 cm thick must be split into enough parts so that the greatest width of any split piece—measured at the thick end of the wood—does not exceed 20 cm.

Additionally, the following conditions must be met:
- Wood processed into steres shall be cut to a length of 30–33 cm;
- The diameter of the processed wood shall be between 5 and 25 cm, with a maximum face width of 20 cm.