500 m3 hard firewood

As part of the procedure, 500 m3 of hard firewood will be purchased for heating.
The wood must be of a hard nature, have a high calorific value and a maximum humidity of 20%.
The wood will be cut to size as follows:
- 150 m3 at a length of 30 cm
- 350 m3 at a length of 50 cm.