• If chimney is connected via extra elbow, it must have diameter no less
than that of the flue pipe outgoing from the boiler with bending radii no less
than 100 mm. If its is not additionally insulated with heat-proof material, it
has to be at a distance from flammable constructions no less than 1,5 m
from above and 0,5 m from other sides.
• Seal gaps well at the junction and inlet to the chimney.
• In the chimney junction, in the convenient location, install holes for
periodic (monthly) soot removal.
• Stainless steel insert is advisable to install in the chimney. In order to do
this qualitatively, we recommend that you contact a company with
experience in this field. The well-placed insert protects the chimney from
the effects of condensation and improves draft. The insert does not
significantly reduce the cross-section of the chimney opening.
• Parts of the insert have to be tightly interconnected (not soldered);
• Install condensate collector in the bottom;
• Fill in the gap between the chimney walls and the insert, at least in the
outer part of the chimney, with non-flammable heat insulation material. On
the top, seal the gap with plaster and tin with a slope (from the hole down to
chimney edge);
• Inside a cold attic, insulate the chimney with non-combustible heat
insulation material.
Always remember that:
• The smoke coming from the boiler via flue pipe to the chimney continues
to cool, the vapours in the smoke condense by setting on the walls of the
chimney, especially in the unheated attic and in the outer part of the
chimney;
• Condensate acids and heat-cold erosion over a few years can destroy the
chimney;
• Remaining unremoved soot in the chimney can ignite over time and can
be a source of fire in the case of an irregular chimney or a flammable roof.
Recommendations:
• Chimney is a very important part of the heating system, so its installation
and boiler connection works can be entrusted only to certified firms
experienced in these kinds of operation.
• If it is impossible to erect chimney of required height and reach the
required draft, install the exhauster. The best suited are exhausters
mounted on the chimney. Of course,
other options are available, they are to
be suggested by experts.
• In order to ensure stabile (even) boiler
combustion, we recommend to use
draft stabilizer, e.g. WZB-1, (see fig. 5)
or similar models.
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