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The flue must satisfy the following requirements:
The flue or chimney must be made of fire-resistant
material, preferably ceramics or stainless steel.
The flue or chimney must be airtight and well-
cleaned and guarantee sufficient draught.
A draught/vacuum of 15 - 20Pa during normal
operation is ideal.
Starting from the flue spigot, the flue must run as
vertically as possible. Changes in direction and
horizontal pieces disrupt the outward flow of com-
bustion gases and may cause soot deposits.
To prevent combustion gases from cooling down
too much, which reduces the draught, ensure that
the interior diameter is not too big.
The flue or chimney should ideally have the same
diameter as the connection collar.
For nominal diameter: see "Technical data"
appendix. If the smoke channel is well insu-
lated, the diameter may be slightly bigger (up to
2x the section of the connection collar).
The section (area ) of the smoke channel must be
constant. Wider segments and (in particular) nar-
rower segments disrupt the outward flow of com-
bustion gases.
In fitting a cover plate/exhaust cap to the flue:
make sure that the cover does not restrict the flue
outlet and that the cap does not impede the out-
ward flow of combustion gases.
The flue must end in a zone that is not affected by
surrounding buildings, trees or other obstacles.
The flue outside the house must be insulated.
The flue should be at least 4 metres high.
As a rule of thumb: 60 cm above the ridge of the
roof.
If the ridge of the roof is more than 3 metres from
the flue: use the measurements given in the fol-
lowing figure. A = the highest point of the roof
within a distance of 3 metres.
Room ventilation
For good combustion, the appliance needs air (oxy-
gen). This air is supplied via adjustable air inlets from
the area in which the appliance is installed.
If ventilation is insufficient, combustion will be
incomplete, which may lead toxic gases to
spread through the room.
As a rule of thumb, the air supply should be
5.5cm²/kW. Extra ventilation is needed when:
The appliance is in a well-insulated area.
There is mechanical ventilation, for example a cent-
ral extraction system or an extraction hood in an
open kitchen.
You can provide extra ventilation by having a vent-
ilation louvre fitted on the outside wall.
Make sure that other air consuming appliances (such
as tumble-driers, other heating appliances or a bath-
room fan) have their own supply of outside air, or are
switched off when you use the appliance.
You can also connect the appliance to an out-
side air supply. A connection kit is supplied for
this purpose. This makes additional ventilation
unnecessary.
Subject to change because of technical improvements
7
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