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Below are the main characteristic traits of the flue duct according to the provisions of
standards UNI 7129 and UNI 10683:
The smoke outlet must be equipped with inspection valves;
The minimum height of the pipe directly connected to the smoke outlet of the boiler must be
between 2-3 m;
If the presence of a horizontal section is necessary, we recommend that the same is of a maximum
length of 1.5 m and with a slope gradient of 3-5% to encourage the smoke to flow away;
Use of a wind-proof and rain-proof terminal to avoid changing the slight overpressure inside
the flue pipe (we recommend you end the flue pipe with a horizontal section);
The outlet ducting must be made with suitable materials which can withstand the products of
combustion and any condensation of the same (the inspection valve can allow any condensation
that has formed to be vented);
The ducts must be built to ensure maximum seal against smoke (UNI 10683);
We recommend you insulate the duct, especially on the outside part exposed to the weather.
Avoid installing completely horizontal sections.
The room where the heat generator is to be installed must not contain any existing or
envisaged smoke suction hoods in order to avoid depressurising the setting.
The air intakes must not be closed.
Make sure the flue pipe is kept clean, cleaning it at least once a year.
In the event of a fire in the flue pipe or duct, switch the boiler off
immediately and disconnect it from the domestic electricity mains
Installing
TECNIKA 28-35
USE AND INSTALLATION MANUAL
Technical dept. - All rights reserved - Reproduction prohibited
Chapter
4
page 18
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