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Schematic diagram fl ue gas connection
(Figure 13)
Trouble-free and effi cient operation is assured if the following conditions for an
optimum combustion are fulfi lled:
Adequate condition of the chimney: good thermal insulation, smooth inner
surface, no leakages
Correct dimensioning of the chimney: cross section and effective height
must be calculated for the intended fuels and loads.
Correct fl ue gas pipe connection: tight, no cross sectional constriction,
slightly rising towards the chimney, not projecting into the chimney.
For shared-fl ue systems: maintain a minimum distance of 60 cm.
Seal unused connection openings with cover lids.
Keep sweeping and cleaning openings, usually located in the basement or
attic storeys, closed at all times. Check seals from time to time and renew if
necessary.
The chimney
• When installing the fl ue gas pipe adhere to the following minimum clearan-
ces from combustible building materials: clearance from wall 20 cm, clea-
rance from ceiling 40 cm.
• Design and condition to suit the regulations applicable at the place of ins-
tallation.
• Prior to connection, inspect for possible faults and defects.
• Effective chimney height of 5 m (from cooking plate to the chimney outlet).
If the height is less, the stove must be connected with a vertical fl ue gas
pipe of at least 1 m length. An effective chimney height of less than 4 m is
not advisable.
• Uniform, square or round internal cross section, insulated to prevent cooling.
• Chimneys made of pre-fabricated components are preferable.
• Assessment of the entire fl ue gas system according to DIN 4705 Parts 1 and
2, with shared-fl ue systems according to Part 3.
Connection stove - chimney
The fl ue pipe is the connection between the stove and the chimney. When ins-
talling the fl ue, please note the following instructions:
• Make sure that the connecting piece can be cleaned (cleaning opening, from
the stove-side, etc.).
• The diameter of the fl ue pipe must not decrease towards the chimney.
• The fl ue pipe must not project into the chimney.
• Vertically positioned fl ue pipes must not exceed a length of 125 cm if they
are not insulated.
• Horizontal pipe sections must not exceed a length of 100 cm.
• The fl ue pipe must not descend towards the chimney, but must incline slight-
ly upward.
• The connection between the stove and the chimney must be strong and leak-
proof. In particular the connection to the masonry of the chimney must be
durable and tight.
The necessary discharge pressure (“Chimney draught”)
The negative pressure prevailing in your chimney, measured in Pascal (“Pa”) is
a measure of the effi ciency of your chimney. The discharge pressure required
for your stove is shown in the table “Technical data” on page 26 and on the
nameplate of the stove.
With new chimneys you can trust the details (calculations) of the manufacturer;
with older chimneys seek the advice of your chimney sweep.
• Insuffi cient discharge pressure would result in incomplete combustion and
consequently in increased formation of soot and tar in the stove and in the
chimney.
• Excessive discharge pressure on the other hand would accelerate combus-
tion, lead to high fl ue gas temperatures (causing damage to the appliance)
and greatly increase fuel consumption.
Figure 13