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GENERAL REQUIREMENTS
A
G
F
J
Fig. R.6: Flue termination
Terminal position for fan-assisted flue (minimum distance)
Directly below an openable, above an opening or
A
horizontal to an opening i.e. air brick, opening
1)
window or other , etc
B
Below gutters, soil pipes or drain pipes
C
Below eaves
D
Below balconies (below car port roof)
E
From vertical drain pipes and soil pipes
F
From internal or external corners
G
Above ground or balcony level
H
From a surface or boundary facing a terminal
I
From a terminal facing a terminal
From an opening in a car port (e.g. door, window)
J
into a dweling
K
Vertically from a terminal on the same wall
L
Horizontally from a terminal on the same wall
M
Distance from adjacent wall for vertical Flue
Table R.1. Terminal position for a fan assisted concentric flue (see fig. R.6)
12
BCD
A
F
A
F
A
E
G
Flue termination
The following details refer to both
flue systems.
a. The terminal must be positioned
b. In certain weather conditions a
B
F
M
G
L
K
c. If the terminal is fitted less than
K
L
Note: Vertical flues must not
terminate within 600 mm of an
openable window, air vent or any
other ventilation opening.
mm
Where a terminal is fitted less than
300
1 m below a plastic gutter or less
than 0.5 m below painted eaves or
any other painted surface then a sui-
25
table shield at least 1 m long should
25
be fitted to protect the surface.
25
25
25
300
600*
1200
1200
In addition, the terminal should not be nearer
1)
than 150 mm to an opening in the building fabric
1500
formed for the purpose of accommodating a built-in
element such as a window.
* BS 5440-1 It is recommended that a fanned flue
300
terminal should be positioned as follows: a) at least
2 m from an opening in a building directly opposite,
500
and b) so that the products of combustion are not
directly directed to discharge across a boundary.
such that the products of
combustion can disperse freely at
all times.
plume of water vapour may be
visible from the flue terminal.
Positions where this could be a
nuisance should be avoided.
2 m above a balcony, above
ground or above a flat roof to
which people have access then a
suitable terminal guard;
280 mm x 280 mm deep, must be
provided and fitted (made by
Tower Flue Components,
Tonbridge, TN9 1TB).
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