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2.4. Chimney flue
The chimney flue must comply with
present standards on the installation of
chimneys.
In rooms equipped with Controlled
Mechanical Ventilation, the ventilation
outlet must never be connected to the
flue.
The appliance must always have its own
chimney flue, never sharing a chimney flue
with another appliance.
2.4.1. Type of flue
The flue must be made of special
material designed to resist the products of
combustion (e.g. stainless steel, enamelled
steel, etc.).
Non-central-heating
(without back boiler) require an insulated,
double-sleeve flue only on those sections
that run outdoors or through cold areas.
Single piping can be used inside the
building, the heat of the gases serving to
heat rooms, insulating only those sections
where excess temperature may cause
damage.
If the chimney is constructed, then it is
necessary to pipe and insulate it to ensure
correct updraught.
The diameter of the pipe must be the
same as the diameter of the flue socket on
the appliance over its entire length in order
to ensure correct operation.
The flue must prevent the entry of
rainwater.
The flue must be clean and airtight over
its entire length.
The flue must be at least 5m tall and the
chimney cap must not hinder the free
release of gases.
If the flue tends to suffer from
downdraught, then it is necessary to fit an
effective anti-downdraught cowl, a static
INSTRUCTIONS FOR THE INSTALLER
cowl or a smoke extraction fan, or reshape
the chimney.
loss of draught they cause, and reduce 45º
bends down to an absolute minimum. Each
45º bend is equivalent to a 0.5m reduction
in flue length. Horizontal flue sections
should not be installed because they cut
updraught a great deal.
then an effective damper must be fitted on
the flueway. This damper must be visible
and accessible.
appliance.
may be reached in the flue, meaning that it
is essential that insulation be enhanced in
appliances
sections in which combustible material is
present (wooden beams, furniture, etc.). It
may even be necessary to protect non-
combustible material in order to prevent
breakage, deformation, etc., as a result of
overheating if the material is not designed
to withstand high temperatures.
flue, no sections being left inaccessible for
cleaning purposes.
2.4.2. Chimney crown
clear the roof, the roof ridge or any
obstacle located on the roof by at least 1m.
Never make 90º bends due to the great
If the flue draws at more than 20 Pa,
The chimney flue must not rest on the
Bear in mind that high temperatures
It must be possible to clean the entire
The upper end of the chimney must
7
2.
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