MTM 52 - Stack Duct Installation; Stack System

7. Stack duct installation
The stack outlet of the MTM 52 stove must be capped with the draught regulator (
which is a part of
the standard stove equipment) in the vertical position so that the exhaust fumes outlet is directed
upwards. The stack must be installed into the exhaust fumes outlet of the draught regulator.
To ensure proper combustion, the stack system must be installed properly.
After the installation the following indications have to be followed:
• pipe diameter: 150 mm,
• use the drop separator so that the condensate can leave the stack duct without damaging
the pipe exchanger.
• check the leaktightness of the stack component connections,
• minimal stack height: 5 metres,
• the stack section outside the building should be insulated (a double wall),
• wind should freely fan the stack outlet from all directions (the end of the stack pipe
should be above the rooftop level),
• if possible, all stack sections should be vertical - horizontal sections should be avoided as well as
stack pipe bends. If they are necessary (e.g. two bends if the pipe runs
through a wall or a window), the maximal bend angle equals 45° and the minimal stack height should
be increased to 6 meters,
• the already existing ventilation ducts must not be used to build the stack system!
CAUTION!!!
IF AN ADDITIONAL HEAT EXCHANGER IS INSTALLED ON THE STACK SYSTEM (e.g. EXHAUST
FUMES ECONOMISER), IT IS ADVISABLE TO CLEAN THE EXCHANGER AT LEAST ONCE A MONTH
(depending on the fuel quality) AS ITS INNER WALLS ARE BEING COVERED WITH DUST, WHICH
RESULTS IN A REDUCED CALORIFIC EFFECT OF THE EXCHANGER. A DECREASED DIAMETER OF
EXHAUST FUMES FLOW WILL CAUSE AN EARLY SWITCH OF THE STOVE INTO THE “OVERFLOW”
PHASE AS A RESULT OF BAD COMBUSTION. Places where the stack runs through the ceiling,
walls or the roof must be insulated so as to avoid fire hazard. It is advisable to use a two-layer
insulated stack pipe wherever there is a possibility of touch contact and outside the building, to
ensure constant proper draught and prevent condensation. Do not place any materials near the
stove, even those which are non-inflammable. Ensure constant air supply, necessary for proper
combustion process.
Fig. 4. Stack system
[min. 0.5 m]
[T-connection ⌀150
with drop separator]
[acid-proof stack
pipe ⌀150]
[draught regulator
⌀130/ ⌀150]