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8.4. Chimney system (Smoke duct, chimney flue and chimney pot)
This chapter is written in accordance with European Standards EN 13384, EN 1443, EN 1856, EN 1457.
The installer must take these Standards and any other local regulations into account.
This manual is in no way to be considered as a replacement for current regulations.
The product must be connected to a suitable smoke exhaust system that guarantees the safe and complete
evacuation of the smoke produced by combustion.
Before positioning the product, the installer must make sure that the chimney flue is suitable.
8.5. Smoke duct, chimney flue
The smoke duct (duct connecting the fire box smoke outlet to the chimney flue inlet) and the chimney flue must,
among other regulatory requirements, in general:
Receive the smoke coming from only one product (it cannot receive the smoke coming from several products);
in some countries there are specific regulations: it is the responsibility of the installer to assess compliance with
local regulations.
Have a predominantly vertical development.
Not have any counter-sloping sections.
Have a preferably circular inner cross-section and in any case with a ratio between sides of less than 1.5.
End on the roof with a suitable chimney pot: it is forbidden to discharge directly from the wall or towards enclosed
spaces, even if outdoors.
Be made of materials with fire reaction class A1 pursuant to UNI EN 13501 or similar national Standard.
Be suitably certified, with an appropriate chimney plate if metal.
Maintain the initial section or vary it only immediately above the product outlet and not along the chimney flue
8.6. Smoke duct
In addition to the general requirements applicable to the smoke duct and to the chimney flue, the smoke duct:
Must not be made of a flexible metal material.
Must be insulated if it passes through unheated rooms or if it passes outside.
It must not pass though rooms in which it is forbidden to install combustion heat generators or rooms where there
is a risk of fire or rooms that cannot be inspected.
It must allow the recovery of soot and it must be inspectable.
In general, it must not have more than 3 bends with a maximum angle of 90°, the assessment of which is the
responsibility of the technician in charge of sizing the system.
In general, any horizontal section can have a maximum (average) length of 3 metres, depending on the draught.
However, bear in mind that long sections facilitate the accumulation of dirt and are more difficult to clean; the
assessment is the responsibility of the technician in charge of sizing the system.
