Flue Terminal Positions - Worcester GREENSTAR Ri Installation And Servicing Instructions

PRE-INSTALLATION
3.9

FLUE TERMINAL POSITIONS

All measurements in millimetres
25 5
3
500
600
2
Boundary
600
300
1
Fig. 18 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 300 mm 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. 600 mm 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. 600 mm minimum clearance from a skylight to a
vertical flue.
4. Vertical flue clearance, 500 mm to non-combustible
building material, and 1,500 mm clearance to
combustible building material.
5. The dimension below eaves, gutters, pipes and
drains 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 a suitable
silicon sealant.
6. 500 mm clearance to any vertical structure on a roof,
600 mm to room sealed flue or 1,500 mm to an open
flue.
7. 1,500 mm between a vertical flue terminal and a
window or dormer window.
22
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 500 mm.
9. The flue cannot be lower than 1,000 mm from the
top of a light well due to the build up of combustion
products.
10. 2,000 mm below a Velux window, 600 mm above or
to either side of the Velux window.
11. 200 mm below eaves and 75 mm below gutters,
pipes and drains.
12. 1,200 mm between terminals facing each other.
13. 300 mm 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. 300 mm above, below and either side of an opening
door, air vent or opening window.
6 720 644 744a (2010/10)
14 25
9
300
13
300
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