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The chimney's inside dimensions must not be too large in order to prevent the
smoke from cooling off too much. For recommended chimney dimensions, see the
technical specification under cover. Larger dimensions can be used if the flue is
well insulated.
The flue's diameter should be the same throughout its whole length. Wider, or
especially narrower segments will disrupt the smoke flow and are best avoided. The
same is true for a cover plate or exhaust hood on top of the chimney. The exhaust
hood must not narrow the chimney's outlet and should be designed in a way that
wind will not hinder, but promote the smoke flow.
Especially if the flue runs through unheated rooms or outside the house, further
insulation is necessary. Metal chimneys, or parts of the chimney outside heated
rooms should always have double-walled, insulated flues. The part of the chimney
outside the roof should always be insulated.
The chimney should be high enough (at least four metres) and should end in a zone
that is clear of nearby buildings, trees or other obstacles. The rule of thumb here is:
60 cm above the ridge of the roof. If the distance between the ridge and the
chimney measures more than three metres, see the dimensions stipulated in the
illustration below. Depending on the presence of nearby buildings or trees, the
chimney should be higher.
3.1.2.
Ventilation
The burning of wood, charcoal or gas involves oxygen consumption. It is of the utmost
importance that the room in which the stove is installed should be sufficiently
ventilated.
Insufficient ventilation may disrupt the combustion process and cause the smoke flow
through the chimney to be interrupted, which may lead to smoke emissions into the
room.
If necessary, you can install a ventilation grille to provide a constant flow of fresh air in
the room. This precaution is particularly necessary in well-insulated rooms with
mechanical ventilation.
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