INSTALLATION INSTRUCTIONS
TR05A140.B1107
25
4.8.1 Flue position
The flue system MUST be installed in accordance with the recommendation contained in BS 5440:1.
The boiler MUST be installed so that the terminal is exposed to the external air.
It is important that the position of the terminal allows free passage of air across it at all times.
If the terminal discharges into a pathway or passageway check that combustion products will not cause nuisance
and that the terminal will not obstruct the passageway.
In certain weather conditions a terminal may emit a plume of steam. Positions where this would cause a nuisance
should be avoided.
It is ESSENTIAL TO ENSURE, in practice, that products of combustion discharging from the terminal
cannot re-enter the building, or any other adjacent building, through ventilators, windows, doors, other
sources of natural air infiltration, or forced ventilation/air conditioning systems. If this should occur,
the appliance MUST BE TURNED OFF IMMEDIATELY.
Where the lowest part of the terminal is fitted less than 2m (6.6ft) above a balcony, above ground, or above a flat
roof to which people have access, the terminal MUST be protected by a purpose designed guard.
Figure 17: Flue terminal positions – BS5440:1
A Directly below an opening window, air vent or any other ventilation opening 300 mm
B Below gutter, drain pipes or soil pipes 75 mm
C Below eaves 200 mm
D Below balcony or carport roof 200 mm
E From vertical drain pipes or soil pipes 150 mm
F From internal or external corners 300 mm
G Above adjacent ground, roof or balcony level 300 mm
H From a surface or boundary facing the terminal 600 mm
I From a terminal facing the terminal 1200 mm
J From opening (door, window) in the carport into dwelling 1200 mm
K Vertically from a terminal on the same wall 1500 mm
L Horizontally from a terminal on the same wall 300 mm
M Above an opening, air brick, opening window etc 300 mm
N Horizontally to an opening, air brick, opening window, etc. 300 mm
J
E
A
G
M
F F
A
D
H,I
TOP VIEW REAR FLUE
D
G
L
K
G
N
B.C
TERMINAL
ASSEMBLY
PROPERTY BOUNDARY LINE
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