18
ENGLISH
INSTALLATION
THE SMOKE DUCT
THE SMOKE DUCT
• if it is metal, it must have CE marking (EN 1856-2) or
some similar national standard marking;
• may not be made of flexible metal material;
• in order to check the flow, it is recommended to use
a damper if the draught is above 25 Pa.
THE FLUE
THE FLUE
:
• it must have a draught capable of creating
depressurisation, which is ideally around 12 Pa.
Lower draughts may lead to leaks of smoke when
the door is opened; higher values tend to generate
fast combustion and reduced efficiency
• must be correctly sized to satisfy the requirements
for flue gas discharging (EN 13384-1)
• should preferably be insulated, in steel with a
circular internal section. If rectangular, the inner
corners must have a radius of not less than 20
mm, with a ratio of the internal dimensions of <1.5
• must normally be at least 4 metres in vertical length
• must be waterproof and thermally insulated to
ensure proper draught
• preferably provide a collection chamber for
unburnt fuel and condensates
• must be at least in the T400 category with
appropriate resistance against soot igniting
• if pre-existing, must be clean, to prevent fire
hazards.
Infiltration of water from condensation
through the flue must be strictly avoided.
If necessary, an anti-condensate ring
should be installed. Ask your chimney
sweep for details.
Damage caused by water from
condensation is excluded from the warranty.
THE CHIMNEY POT
THE CHIMNEY POT
• must be anti-downdraught
• must have an internal cross section equivalent to
that of the flue and a fumes outlet at least double
that of the interior of the flue
• for dual flues (which should be spaced at least 2
m apart) the chimney pot of the flue receiving the
fumes from the solid fuel appliance or that from
the higher storey, must be at least 50 cm higher
• needs to beyond the back flow zone
• it must allow for maintenance of the chimney
INSTALLER