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Pre-Installation
3.10
Flue terminal positions
All measurements in millimetres
3
300
1,500
2
1
300
1,500
1,200
Boundary Line
Fig. 32 Flue terminal positions - 50-V2 and 65-V2
NOTICE:
▶ All measurements are the minimum clearances required.
▶ Terminals must be positioned so to avoid combustion products entering the building.
▶ Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and fittings (125mm flue
bracket (pack of 3) = T-000-082-131. 150mm flue bracket (pack of 3) = 7-716-191-102).
Key to illustration
1. 300mm adjacent to a boundary line.
2. The dimension below eaves, balconies and car ports can be reduced
to 25mm, as long as the flue terminal is extended to clear any
overhang. Any external flue joints must be sealed with suitable
silicon sealant.
3. 1,500mm between a vertical flue terminal and a window or dormer
window, 300mm between two flue terminals.
4. 1,200mm between terminals facing each other.
5. Vertical flue clearance, 300mm adjacent to a boundary line.
6. 600mm distance to a boundary line, unless it will cause a nuisance.
BS 5440:Part 1 recommends that care is taken when siting terminal
in relation to boundary lines.
7. 600mm minimum clearance from a skylight to a vertical flue.
8. Vertical flue clearance, 500mm to non-combustible building
material, and 1,500mm clearance to combustible building material.
9. 300mm above, below and either side of an opening door, air vent or
opening window.
10. 600mm diagonally to an opening door, air vent or opening window.
11. 300mm to an internal or external corner.
12. 2,000mm below a Velux window, 600mm above or to either side of
the Velux window.
13. 400mm from a pitched roof or in regions with heavy snow fall
500mm.
14. 500mm clearance to any vertical structure on a roof, 600mm to
room sealed flue or 1,500 to an open flue.
15. 200mm below eaves and 75mm below gutters, pipe and drains.
16. The dimension below eaves, balconies and car ports can be reduced
to 25mm, as long as the flue terminal is extended to clear any
overhang. Any external flue joints must be sealed with suitable
silicon sealant.
20
2
25
5
7
300
600
600
300 300
6
4
400
300
12
300
15
8
500
10
600
9
11
300 300
25
300
300
17. Flue clearance must be at least 300mm from the ground. Terminal
guards must be fitted if the flue is less than 2 metres from the ground
or if a person could come into contact with the flue terminal.
18. 600mm distance to a surface facing a terminal, unless it will cause a
nuisance. BS 5440: Part 1 recommends that care is taken when
siting terminals in relation to surfaces facing a terminal.
Note:
▶ Installations in car ports are not recommended.
▶ The flue cannot be lower than 1,000mm from the top
of a light well due to the build up of combustion
products.
▶ Dimensions from a flue terminal to a fanned air inlet
to be determined by the ventilation equipment
manufacturer.
In instances where the combined output of the installation exceeds
70kW net heat input the flue solution must be installed in accordance
with the latest version of IGE/UP/10.
Pluming will occur at the terminal so terminal positions where this could
cause a nuisance should be avoided. Active plume management is
encouraged.
The air supply and the flue gas exhaust must meet the applicable general
regulations. Please also consult the instructions provided with the flue
terminal kits prior to installation.
The boiler must be installed so that the terminal is exposed to external
air.
It is important that the position of the terminal allows the free passage of
air at all times.
Minimum acceptable spacing from the terminal to obstructions and
ventilation openings are specified in IGE/UP/10. The minimum space
between two concentric flue terminals is 300mm.
25
16
13
500
14
200
300
18
600
16
17
300
300
6720814332 (2018/04)
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