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METAL-FACH Heating Technology
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Connecting the boiler to the chimney
(Installer)
Smoke ducts
The purpose of the flue is to reliably convey the flue gases to the outside and to draw in air for fuel combustion.
The chimney draught required for this depends on:

the temperature difference between hot flue gases and cold air,

the effective height of the chimney,

chimney section size not less than 20 x 20 cm,

the design of the chimney (as smooth as possible chimney construction (internal surfaces as smooth as
possible) and tightness of joints.
The effective height of the chimney is the height difference between the highest hearth and the chimney outlet.
The effective height of individual chimneys must be at least 4 m and common chimneys for solid and liquid fuels
at least 5 m. The height difference between two fireplaces must not be greater than 6.5m. In the case of sloping
roofs, the chimneys should terminate at the ridge (the highest point of the roof), in an area of free wind flow.
This avoids draught disturbance. The position of the building in relation to other buildings must always be taken
into account.
Selection of chimney
In most cases an approximate method or selection according to chimney manufacturer's diagrams is sufficient
for selecting the chimney. In special cases (unfavourable pressure and temperature relations, large flue gas
volume) chimneys are calculated according to the binding norm. Low outlet flue gas temperature at nominal
boiler output can cause emission of damp flue gases, soot deposition, insufficient chimney draught. This can
lead to dampness and corrosion of brick chimneys. It is recommended to use a chimney insert:

in new buildings, a ceramic flue system resistant to condensation, thermally insulated and with a
condenser is recommended,

in existing buildings, an upgrade of the brick chimney is recommended through the use of a stainless
steel chimney system (designed for solid fuel boilers) single or double-wall.
Flue pipe
The boiler is connected to the chimney by a flue pipe and a flue pipe. Smoke ducts are pipes and fittings that are
laid in rooms. Smoke ducts meet fire safety requirements for chimneys and are often made of the same
material as the main chimney. Smoke ducts should be made of non-combustible products. Smoke ducts or
casing should meet the requirements specified in the Polish Standard for fire testing of small chimneys. An
enclosure made of 12 cm thick solid brick, built on cement-lime mortar, with external plaster or pointing, is
acceptable. Joints should be as short as possible and laid with an elevation to the chimney to avoid heat loss and
additional resistance. They must not be routed to other floors. Flue pipes should not be laid in rooms where
fireplaces cannot be installed, nor should they be placed in walls or ceilings. In order to protect the chimney
against dampness and draught limitation, acid resistant or ceramic chimney liners should be used, with