Flex-Line
Installation manual
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16
Flue gas system
General
The flue gas system must be designed and approved for use for fireplaces that use wood as a fuel. The
flue gas system must meet national and local regulations and it must at least satisfy the following
requirements:
Temperature class
T400
(nominal operating temperature ≥ 400° C)
Soot burning resistance category:
G
(system with resistance category)
Corrosion resistance class:
2
(natural wood)
Length
The draught calculated on the flue gas system must be between 10-12 Pa.
Flue gas systems without a flue gas fan with lengths L ≤ 4 m are not permitted.
The draught conditions must be checked by taking appropriate measurements before lining the
system.
A flue gas fan can be installed inside the flue gas system to achieve stable draught ratios.
Connecting piece
The following requirements must be met when installing the connecting piece.
Permitted materials:
Steel
≥ 2 mm
sheet thickness
Chrome nickel steel
≥ 1 mm
sheet thickness
The connecting piece must be fed directly from the fireplace insert to the chimney and aid flow.
All connections must withstand long-term thermal resistance and be tight.
Feedthroughs for connecting pieces that feed through flammable environments must be carried out
professionally. The national and local requirements must be met.
Possibilities for regular cleaning must be provided.
Static support
The flue gas system must be erected to be self-supporting. It may not be
supported by the fireplace insert.
► Follow the details provided by the manufacturer
► Check the load-bearing capacity of the building shell involved in the
installation
