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damper is in its “closed” position. If
local regulations permit, two con-
tained fireplaces can be connected to
the same chimney. However, you must
abide by local regulations regarding
the distance between the two con-
nections.
Wood-burning stoves must
never be connected to chimneys that
are also linked to a gasfired heater.
An
efficient stove makes high demand on
chimney properties – so always have
your local chimney sweep evaluate
your chimney.
Connection to a brick chimney
Brick a thimble into the chimney and
seat the flue gas pipe in this. The
thimble and flue gas pipe must not
penetrate the chimney opening itself,
but must be flush with the inside
of the chimney duct. Joins between
brickwork, the thimble and flue gas
pipe must be sealed with fireproof
material and/or beading
Connection to a steel chimney
When fitting a connection from a top-
output stove directly to a steel chim-
ney, we recommend fitting the chim-
ney tube inside the flue gas spigot so
that any soot and condensation drops
into the stove itself rather than collec-
ting on the exterior surface of the
stove.
For connections to chimneys that are
run through ceilings, all national and
local regulations regarding distance to
flammable material must be followed.
It is important that the chimney is
fitted with roof support so that the
top panel of the stove is not required
to bear the entire weight of the chim-
ney (excessive weight may damage the
stove).
Draft conditions
Poor draft may result in smoke being
emitted from the stove when the door
is opened. The minimum chimney
draft to ensure satisfactory combu-
stion in stoves of this kind is 12 PA.
However, there will still be a risk of
smoke emission if the firing door is
opened during powerful firing. The
flue gas temperature at nominal
output is 270°C when expelled to an
exterior temperature of 20°C. The flue
gas mass flow is 4.0 g/sec. The chimney
draft is generated by the difference
between the high temperature of the
chimney and the low temperature of
the fresh air. The length and insulation
of the chimney, wind and weather
conditions also have an effect on the
ability of the chimney to generate ap-
propriate under-pressure.
If the stove has not been used in a
while, check that the chimney and
stove are not blocked with soot, bird
nests, etc., before using it.
Reduced draft can occur when:
- The difference in temperature is too
small – due to insufficient chimney insu-
lation, for example.
- The outdoor temperature is too high
– in summer, for example.
- No wind is blowing. - The chimney is
too low and sheltered. - The chimney
contains false air.
- The chimney and flue gas pipe are
blocked.
- The house is too airtight (i.e. when
there is an insufficient supply of fresh
air).
- Poor smoke extraction (poor draft
conditions) due to a cold chimney
or bad weather conditions can be
compensated for by increasing the
airflow into the stove.
Good draft occurs when:
- The difference in temperature bet-
ween the chimney and outdoor air
is high.
- The weather is fine. - The wind is
blowing strongly.
- The chimney is of the correct height:
at least 4.00 m above the stove and
free of the roof ridge.
