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PRE-INSTALLATION
3.9
FLUE TERMINAL POSITIONS
All measurements in millimetres
25
5
3
500
600
2
Boundary
600
300
1
Fig. 22 Flue terminal positions
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 bracket part numbers.: 100mm - 7 716 191 092, 125mm - 8 716 110 272).
Key to illustration
1. 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.
2. 600mm distance to a boundary, unless it will cause
a nuisance. BS 5440: Part 1 recommends that care is
taken when siting terminals in relation to
boundaries.
3. 600mm minimum clearance from a skylight to a
vertical flue.
4. Vertical flue clearance, 500mm to non-combustible
building material, and 1,500mm clearance to
combustible building material.
5. The dimension below eaves, gutters, pipes and
drains 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 a suitable
silicon sealant.
6. 500mm clearance to any vertical structure on a roof,
600mm to room sealed flue or 1,500mm to an open
flue.
7. 1,500mm between a vertical flue terminal and a
window or dormer window.
24
300
6
500
Velux Window
Drainpipe
25
300
4
1,500
500
Dormer
7
Window
1,500
400
8
10
11
200
1,200
12
Window
300
15
8. 400mm from a pitched roof or in regions with heavy
snow fall 500mm.
9. The flue cannot be lower than 1,000mm from the top
of a light well due to the build up of combustion
products.
10. 2,000mm below a Velux window, 600mm above or
to either side of the Velux window.
11. 200mm below eaves and 75 mm below gutters,
pipes and drains.
12. 1,200mm between terminals facing each other.
13. 300mm to an internal or external corner.
Installations in car ports are not
recommended.
14. The dimension below eaves, balconies and car ports
can be reduced to 25 mm, as long as the flue
terminal is extended to clear any overhang.
Any external flue joints must be sealed with suitable
silicon sealant.
15. 300mm above, below and either side of an opening
door, air vent or opening window.
6 720 644 743a (2010/10)
14
25
9
300
13
300
6720643895-13.2Wo
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