The flue assembly shall be so placed or shielded as to prevent ignition or damage to any part of
the building.
NOTE:
In addition, the terminal should not be located closer than 150 mm from a wallopening
provided for e.g. a window. Boundary flue terminations must as a minimum comply with
Building regu-lation part „J“ 600 mm and should also be in accordance with the Guide to
Condensing Boiler Installation which recommends 2.5 m from wall, fence or boundary.
Where a plume diverter terminal is used this is measured in the direction of the flow of
products.
BS 5440–1: It is recommended that the fanned flue terminal should be positioned as follows:
1. at least 2 m from an opening in the building directly opposite, and
2. so that the products of combustion are not directed to discharge across a boundary.
1. Dimensions B, C and D: These clearances may be reduced to 25 mm without affecting
the performance of the boiler. In order to ensure that the condensate plume does not
affect adjacent surfaces the terminal should be extended as shown in Fig. 3.7.
2. Dimension F: This clearance may be reduced to 25 mm without effecting the
performance of the boiler. However, in order to ensure that the condensate plume does
not affect adjacent surfaces a clearance of 300 mm is preferred. For IE,
recommendations are given in the current edition of IS 813.
Fig. 3.7 Flue termination under balcony/eves
3.5.2 Internal flue installation
The flue can be installed from inside the building when access to the outside wall face is not
practicable.
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