5
5.2. Combustion air supply
It must be ensured that there is sufficient fresh air at the place of installation.
5.3. Outside air connection
We recommend using the outside air connection for the supply of combustion air in order not to use up the
valuable indoor air when heating.
To do this, connect the air intake elbow located on the back to a hose or a similar, suitable air duct or to a
chimney system designed for this purpose. The diameter of the air duct must be at least the diameter of
the outdoor air connection on the stove.
The end of the air duct must be located outside or in a well ventilated area (basement).
It is not recommended to feed the cold air into the room from outside via a direct duct, as this can lead to the
build-up of condensation.
In order to guarantee a sufficient supply of air, the duct should not be longer than approx. 3 m and not
have too many bends.
If the duct leads outside, it must end with a 90° bend facing down or a wind protection device (see Figure
4).
Figure 4:
Wind protection of air supply duct
For operation independent of indoor air with RLU certified appliances, the outside air connection must be
connected.
For the dimensions of the air supply duct:
Air supply duct diameter Maximum length
Max. number of 90°
bends
50mm
0.5 m
1
100mm
3 m
3
If the dimensions are lower than specified, then it is not possible to operate the fireplace properly and it will lead
to increased contamination of the burner and inspection window.
