PRE-
INS
TALL
A
TION
INSTALLATION & SERVICING INSTRUCTIONS
16
TERMINAL OUTLET POSITIONS
8 716 115 219c (03.2010)
TERMINAL OUTLET POSITIONS
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 25 mm, as long as the flue terminal is extended
to clear any overhang. Any external flue joints must be sealed
with suitable silicon sealent.
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.
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 75mm below gutters, pipes and
drains.
12. 1,200mm between terminals facing each other.
13. 300mm to an internal or external corner.
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. Installations in car ports are not
recommended. Any external flue joints must be sealed
with suitable silicon sealent.
15. 300mm above, below and either side of an opening door,
air vent or opening window.
NOTE:
All measurements are the minimum clearances required.
Terminals must be positioned so to avoid combustion
products entering the building.
Dormer
Window
Boundary
Drainpipe
Velux Window
3
2
4
6
8
11
12
13
7
1
500
600
500
500
300
300
300
300
300
25
200
1,500
1,500
1,200
300
600
Window
15
9
10
25
14
25
5
All measurements in millimetres
400
