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Thermocet Trimline 120 DB Tunnel - 1138 Seite 13

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The concentric flue system is composed of an inner- and an outer tube.
These tubes are concentrically arranged; through the inner tube, the combustion gases are evacuated and the fresh
combustion air is supplied between the inner and outer tube.
9.1 Components of the concentric flue system.
Different connections are possible using the concentric flue system. These are:
Through the roof face and through the exterior wall.
There are various options for mounting the lay outs for this system,
however, there are a few important requirements/conditions:
* The maximum recommended vertical flue length is 12 metres (the sum of the flue length and the
calculation lengths for the bends).
* 90° bends have a 2-metre horizontal calculation length.
* 45° bends have a 1-metre horizontal calculation length.
* The outlet can be installed at any point on the roof face or exterior wall (supply and discharge in
an identical pressure area), but must meet applicable regulations.
* Ducts may not be insulated.
9.2 Construction of concentric flue system
Indirect wall connection.
* The outlet may be installed in the wall, taking any hindrance to the surrounding area into consideration,
according to national, regional, local standards and regulations.
Ensure wind pressure on the flue terminal is not too extreme, such as a balcony, flat roof,
corners and in small alleys etc., as this may negatively influence the unit efficiency.
* Provide a recess in the exterior wall of around 155 mm for concentric 100-150, and 205 mm for
concentric 130-200. (in a flammable wall ensure there is 50 mm of extra space around the outer
pipe and use fireproof casing) and fix the exterior wall duct with the wall plate to the outer side of
the wall. The wall plate of the exterior wall duct must be sealed sufficiently against the wall on
the outside, to avoid moisture and/or flue gas leaks into the living space.
* The flue should be cased if necessary. Sufficient fireproof measures must also be taken when
the flue is being mounted along flammable materials.
* Determine the position of the unit and outlet and begin construction of the flue with the connection
on the unit, paying attention to the direction of installation and connecting the elements by means
of locking bands.
* An adjustable length can be used between the bends or when connecting to the unit.
If necessary, use wall brackets to support the flue.
Rooftermination.
* The flue terminal can be located at any random place on the roof face (supply and exhaust in
identical pressure areas) and must meet the applicable rules and regulations.
* A roof flashing for a flat roof or a lead flashing for sloping tiled roofs can be used for a
watertight connection. Use various elbows for making the proper connection, if required.
The recess in the roof decking should be 5 cm larger all around, to ensure sufficient fire resistance.
* One needs to take into account the regulation regarding fire resistance between rooms
(See national, regional, local standards and regulations). A casing made of fireproof material
(e.g. 12 mm Promatect fire resistant plate) must be used at 25mm from the outside duct.
* Determine the position of the unit and outlet and begin construction of the flue with the connection
on the unit (always 1 metre vertical first), paying attention to the direction of installation!
The flue must be installed dripless. Connect the elements by using locking bands.
Ensure the gas tightness of all connections is correct.
* An adjustable length can be used between the elbows or when making the connection to the unit and/or the
roof terminal. Use 2 wall brackets to support the flue on each floor.
9. CONCENTRIC FLUE SYSTEM
NOTICE
Ensure the restriction plate in the fire is mounted in the correct manner, as indicated in these instructions.
The correct restriction plate will provide the unit with the most optimal efficiency, flame image and combustion.
Mounting an incorrectly placed restriction plate may cause malfunction of the unit.
… 13 …

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