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07.2
FLUE OR FUME EXHAUST SYSTEM
The flue or fume exhaust system is a fundamental element for the proper functioning of the stove and must comply with the following
general standards:
EN1856-1
Chimneys. Requirements for metal chimneys - Part 1: System chimney products
EN1856-2
Chimneys. Requirements for metal chimneys - Part 2: Metal flue liners and connecting flue pipes
UNI 10683
Heat generators operating with wood or other solid bio fuels - Installation requirements
The diameter of the flue must be sized according to the technical specifications of the appliance and type and place of installation. Each
appliance must have its own chimney flue without any inlets from other appliances.
The exhaust duct of the combustion products generated by the forced draught equipment must respond to the following requirements:
•
it is necessary to use union joints and pipes with pressure resistant seals, as the union of the flue could be slightly pressurised
while the appliance running
•
all changes in direction must be open to inspection to facilitate maintenance
•
correct draught to maintain depression in the combustion chamber, as per the technical specifications, must be guaranteed
•
it must be watertight, waterproof and suitably isolated and insulated
•
must be made of suitable materials that resist normal mechanical stress, heat, the action of the combustion products and acid
condensations
•
must be prevailingly vertical structures with deviations from the axis not greater that 45°
•
must be adequately distanced from combustible or inflammable materials via an air space or suitable insulation
•
must have an internal section which is preferably circular: square or rectangular sections must have rounded corners with a
radius of no less than 20 mm
•
must have an internal section that is constant, free and independent
If the flue is installed externally it must be insulated to prevent the cooling of fumes and formation of condensation. The same is valid for
the tract from the roof to the chimney cap (Torrino). For the union between the stove and the flue, or if there are deviations or curves, for
easier, quicker and safer installation, we recommend using double-walled stainless steel pipes.
The use of pipes in fibre cement for connecting the equipment to the flue is forbidden.
Exhaust pipes must not run through rooms where the installation of combustion equipment is forbidden. The union must be connected
to the flue in such a way as to ensure they remain airtight when the appliance is operating in pressurised conditions and to avoid the
formation of condensation and its conveyance to the appliance.
1
2
2
Exemple scheme for back flue-gas outlet
20
3
4
5
. Airtight steel sheet
1
6
metal
. 45° Curves
2
. Fume exhaust
3
6
. External insulated flue
4
. Insulated T union for
5
condensation
. Non-insulated pipe
6
It has to be avoid, as much as possible, the assembly of
horizontal sections. In any case, the horizontal segment (or its
horizontal projection) do not have to be longer than two meters
with minimum slope not less than 5%. The horizontal section
does not have to be connected directly to the smoke fan output
but after the first vertical segment (6) Fig.1.
The chimney system for the smoke exhaust MUST be
dimensioned and projected by a Qualified Engineer.
He will determine the proper smoke exhaust system
taking into consideration the product technical data,
kind of installation, installation location and mostly the
installation technical regulation in force. The Engineer
will give indications to the installer about the materials to
use, smoke path section, insulation thickness, corrosion
resistance and all requirements needed for the correct
working of the system product-chimney.
The correct dimension of the air intake for ventilation and
aeration of the installation location MUST be verified in
conformity with the technical regulation in force.
Malfunctioning of the product caused by a smoke exhaust
not properly projected and dimensioned WILL NOT be
object of objections to Jolly-Mec and interventions at Jolly
Mec charge.
For appliance that must reach ceiling or wall exhaust outlets
that are not coaxial with regard to the issue of the fumes from
the machine, changes in direction must be made using an open
elbow of 45° (see Fig.1).
The use of counter slope elements is forbidden. The flue union
must have a constant section and allow soot to be collected and
swept away. Changes in cross-section are only allowed at the
outlet of the heat generator: the use of adaptors on the coupling
with the chimney flue is prohibited.
Running other air ducts and installation pipes inside the exhaust
pipes, even if oversized, is forbidden.
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