3
sponds to a diameter of 150 mm. If a
damper is fitted in the flue gas pipe,
there must always be at least 20 cm
2
of free passage, even when the dam-
per is in its “closed” position. If local
regulations permit, two contained fi-
replaces can be connected to the same
chimney. However, you must abide
by local regulations regarding the di-
stance between the two connections.
Wood-burning stoves must never be
connected to chimneys that are also
linked to a gasfired heater. An effi-
cient 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 it-
self, 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 col-
lecting on the exterior surface of the
stove.
Changing from top to back outlet - see
figure 2-11 on page XX.
For connections to chimneys that are
run through ceilings, all national and
local regulations regarding distance
to flammable material must be follo-
wed. 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 - see table on page 9. The flue
gas temperature at nominal output
is 257°C when expelled to an exterior
temperature of 20°C and the flue gas
mass flow - see table on page 9.
However, there will still be a risk of
smoke emission if the firing door is
opened during powerful firing. The
chimney draft is generated by the dif-
ference between the high tempera-
ture of the chimney and the low tem-
perature 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 appropriate 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 in-
sulation, for example.
- The outdoor temperature is too
high – in summer, for example.
- No wind is blowing. - The chimney
is too low and sheltered. - The chim-
ney 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 com-
pensated for by increasing the air-
flow into the stove.
Good draft occurs when:
- The difference in temperature bet-
ween the chimney and outdoor air
is high.
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