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INSTALLATION & SERVICING INSTRUCTIONS
6-720-611-730b (12.05)
15
FLUE OUTLET POSITIONS
FLUE OUTLET POSITIONS
Flue terminals must be positioned to avoid
combustion products entering into buildings.
The flue must be fitted and terminated in
accordance with the recommendations of
BS5440 : Part 1.
The flue must not cause an obstruction.
Discharge from the flue outlet must not be a
nuisance.
Flue gases have a tendency to plume and in
certain weather conditions a white plume of
condensation will be discharged from the flue
outlet which could be regarded as a nuisance,
for example, near security lighting.
There should be no restriction preventing the
clearance of combustion products from the
terminal.
The air inlet/outlet duct and the terminal of the
boiler must not be closer than 25mm to any
combustible material. Detailed recommendations
on protection of combustible materials are given
in BS 5440:1
A protective terminal guard must be fitted if the
terminal is 2m or less above a surface where
people have access.
The guard must be spaced equally (minimum
50mm) around the flue and fixed to the wall with
plated screws.
See 'Contact Information' on the inside front
cover for flue guard information.
Minimum dimensions of flue terminal positions for balanced room sealed flues with fanned
draught:
DRWG.
REF:
TERMINAL POSITION (KW INPUT EXPRESSED IN NET)
DISTANCE
A
1
Directly below an opening, air brick, opening windows, etc.
300mm
B
1
Above an opening, air brick, opening window, etc.
300mm
C
1
Horizontally to an opening, air brick, opening window, etc.
300mm
D
Below gutters, soil pipes or drain pipes
75mm
E
Below eaves
200mm
F
2
Below balconies or car port roof (lowest point)
200mm
G
From a vertical drain pipe or soil pipe
150mm
H
From an internal or external corner or to a boundary alongside the terminal
**300mm
I
Above ground, roof or balcony
300mm
J
From a surface or boundary facing the terminal
**600mm
K
From a terminal facing the terminal
1200mm
L
2
From an opening in the car port (e.g. door, window) into the dwelling
1200mm
M
Vertically from a terminal on the same wall
1500mm
N
Horizontally from a terminal on the same wall
300mm
O
From a vertical non-combustible structure on the roof
*
P
Above intersection with roof
*
Q
Adjacent to windows or openings on pitched or flat roofs
600mm
R
Below windows or openings on a pitched roof only
2000mm
1
In addition, the terminal should not be nearer than 150mm (fanned draught) to an opening
in the building fabric formed for the purpose of accommodating a built-in element such as a
window frame.
2
Not recommended.
* See instructions supplied with vertical flue kits.
** Care should be taken to ensure the siting of a terminal does not cause a nuisance to adjoining
properties.
boundary
F
L
G
I
A
B
I
H
J
C
P
D,E
P
O
H
H
P
N
M
K
R
P
P
Q
Q
Q