diameters; for details, see section 5.6/5.7:
• the pipe diameter +10 mm for a passage through non combustible material;
• the pipe diameter +100 mm for a passage through combustible material.
5.4. Flue gas discharge / combustion air supply system in appliances with closed combustion
5.4.1. General
The appliance's type of discharge system is stated in Appendix 2, Table 2.
The appliance will be connected to a combined flue gas discharge / combustion air supply system,
hereafter to be referred to as the concentric system.
The passage to the outside can be made with both a wall terminal and roof terminal. If necessary, you
can also use an existing chimney
• Only use the concentric system supplied by ERSEL® This system has been tested in combination with
the appliance. ERSEL® can not guarantee a proper and safe operation of other systems and does not
accept any responsibility or liability for this;
• For connecting to an existing chimney you should only use the chimney kit supplied by ERSEL®.
5.4.2. Construction of the concentric system
Depending on the construction of the concentric system, the appliance will have to be further adjusted
with possibly a restrictor slide or air inlet guide. See Tables 4 and 7 for determining the correct
adjustment and section 'Adjustment of the appliance' for the method of working.
The concentric system with wall or roof terminal has to comply with the following conditions:
• In appendix 2, table 4 or 6 you can find whether a concentric pipe should be connected and what the
minimum vertical length would have to be.
• Determine the permissibility of the required discharge.
• When using a wall terminal, the following applies:
• The total vertical pipe length, when using a wall terminal, may have a maximum length that you can
find in Appendix 2, Table 4.
• The minimum vertical pipe length, when using a wall terminal, can be found in appendix 2, table 4.
• The total horizontal pipe length, when using a wall terminal, may have a maximum length that you
can find in Appendix 2, Table 4.
Tip: In the horizontal section, 1 bend of 90° may be included. This bend counts for 2 metres. This
means that the maximum allowed length is reduced by 2 metres. A 45° bend counts for 1 metre.
When using a roof terminal, the following applies:
The construction of the chosen system, when using a roof terminal, must be permissible according to
Appendix 2, Table 6. (See the method of working described below)
The working method below indicates how the permissibility is determined of a concentric system when
using a roof terminal.
1. Count the number of 45° and 90° bends required
2. Count the total number of whole metres of horizontal pipe length;
3. Count the total number of metres of vertical and/or sloping pipe length (roof terminal excluded).
4. In the first 2 columns of Table 6, look for the number of bends required and the total horizontal pipe
length.
5. In the top row of Table 6, look for the required total vertical and/or sloping pipe length.
6. Use Table 7 to determine how the appliance should be adjusted
5.4.3. Placing the Concentric System
• Maintain a distance of at least 50 mm between the outside of the concentric system and the walls
and /or ceiling. If the system is built in (for instance) a cove, it should be made with non combustible
material all around it;
• Use heat-resistant insulation material when passing through combustible material;
• The rosette of the wall terminal is too small to seal the opening when passing through combustible
material. That is why you should first apply a sufficiently large heat-resistant intermediate sheet to the
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