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Fig. A
Flue and connection to the same
The Flue is a fundamental component for correct functioning of the thermo stove. The minimum section of the flue must be that indicated in the thermo stove
technical features (180 mm). Each thermo stove must be equipped with its own flue, without other intakes (boilers, chimneys, stoves etc...). Flue dimensions
are closely related to its height, which must be measured from the thermo stove flue gas outlet to the chimney base. In order to guarantee draught, the
chimney flue outlet surface must be twice as big as the flue section. The combustion products exhaust pipe, generated by the forced draught appliance, must
respond to the following requisites:
Combustion products sealed, waterproof and suitably isolated and insulated in the same way as the conditions of use (cf UNI 9615);
Realised with suitable materials in order to resist to normal mechanical stress, heat, action of the combustion products and in the event of
condensation;
Upward alignment after the vertical tract throughout the remaining pathway with 20% minimum gradient.
Preferably circular internal section: squared and rectangular sections must have rounded angles with radius larger than 20 mm;
Constant, free and independent internal section;
Rectangular sections with 1:5 maximum ratio between the sides
If the flue is installed externally it is absolutely necessary that it is insulated in order to avoid the flue gas cooling and the formation of
condensate;
For the assembly of the flue gas pipes (which go from the appliance to the flue inlet) elements of non-combustible material must be used, which are
suitable for resisting combustion products and their condensation;
It is forbidden to utilise fibre cement pipes to connect the appliances to the flue;
Flue pipes must not pass through places in which the installation of combustion appliances is forbidden;
The assembly of flue pipes must be performed in a way to guarantee the sealing against flue gas for the appliance functioning conditions in low
pressure;
The assembly of horizontal tracts is forbidden;
It is forbidden to use tilted elements;
The flue gas pipe must allow the recovery of soot or be cleanable and must have a constant section;
It is prohibited to make other air intake channels and pipes, for plant engineering, transit inside the flue gas pipes, even if over-dimensioned.
ATTENTION: IT IS PROHIBITED TO INSTALL DRAUGHT REGULATION VALVES (BUTTERFLY VALVES).
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