PRE-INSTALLATION
6 720 803 599 (2012/06)
18
3.9
FLUE TERMINAL POSITIONS
Fig. 19 Flue terminal positions
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. External flue joints must be sealed with suitable
silicon sealant.
3. 1,500mm between a vertical flue terminal and a window or dormer
window.
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 500mm in regions with heavy snow
fall.
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. External flue joints must be sealed with suitable
silicon sealant.
17. Flue clearance must be at least 300mm from the ground. Terminal
guards must br 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.
16
600
300
200
300
1,200
Boundary Line
1,500
1,500
All measurements in millimetres
2
1
12
11
10
9
5
18
7
6
13
15
4
3
17
14
300 300
300
300
300
300 300
500
600
300
600
600
400
300
25
8
300
500
600
6720643895-13.3W
o
300
25
2
25
16
2m
1m
52mm
104mm
NOTICE:
B
All measurements are the minimum clearances required.
B
Terminals must be positioned so to avoid combustion products entering the building.
B
Support the flue at approximately one metre intervals and at a change of direction, use suitable brackets and fittings (flue brackets
100mm x 6 part number:7 716 191 173, flue bracket 125mm part number: 7 716 191 174).
Note:
B
Installations in car ports are not recommended.
B
The flue cannot be lower than 1,000mm from the top
of a light well due to the build up of combustion
products.
B
Dimensions from a flue terminal to a fanned air inlet to
be determined by the ventilation equipment
manufacturer.
