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PRE -
INSTALLATION
FLUE TERMINAL POSITIONS
• The flue must be fitted and terminated in
accordance with the recommendations of
BS5440 : Part 1.
• The flue must not cause an obstruction.
• Discharge and any noise from the flue outlet
must not cause 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. This could be a nuisance, for example,
near security lighting.
• 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
to which 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 (inside front cover).
Minimum dimensions of flue terminal positions for balanced room sealed flues with
fanned draught:
DRWG. TERMINAL POSITION DISTANCE
REF:
A
1
Directly below an opening, air brick, opening windows, etc. 300mm
B
1
Above an opening, air brick, opening window, etc. 300 mm
C
1
Horizontally to an opening, air brick, opening window, etc. 300 mm
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 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 non combustible vertical structure on the roof
P Above intersection with the roof
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 terminal siting
does not cause a nuisance to adjacent properties.
*
*
*
**
**
**
600mm
600mm
2000mm
Terminals adjacent to windows or openings on pitched
and flat roofs.
The flue should not penetrate
the shaded area.
FLUE TERMINAL POSITIONS
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
16