12
GENERAL REQUIREMENTS
Flue termination
The following details refer to both
flue systems.
a. The terminal must be positioned
such that the products of
combustion can disperse freely at
all times.
b. In certain weather conditions a
plume of water vapour may be
visible from the flue terminal.
Positions where this could be a
nuisance should be avoided.
c. If the terminal is fitted less than
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).
Note:
Vertical flues must not
terminate within 600 mm of an
openable window, air vent or any
other ventilation opening.
Where a terminal is fitted less than
1 m below a plastic gutter or less
than 0.5 m below painted eaves or
any other painted surface then a sui-
table shield at least 1 m long should
be fitted to protect the surface.
A
BCD
A
G
H, I
F
J
B F
M
L
L
K
K
G
G
F
F
E
A
A
Fig. R.6: Flue termination
Terminal position
for fan-assisted flue (minimum distance)
mm
A
1)
300
B
Below gutters, soil pipes or drain pipes
25
C
Below eaves
25
D
Below balconies (below car port roof)
25
E
From vertical drain pipes and soil pipes
25
F
From internal or external corners
25
G
Above ground or balcony level
300
I
From a terminal facing a terminal
1200
K
Vertically from a terminal on the same wall
1500
L
Horizontally from a terminal on the same wall
300
M
Distance from adjacent wall for vertical Flue
500
GW 595/2
J
From an opening in a car port (e.g. door, window)
into a dweling
1200
H
From a surface or boundary facing a terminal
600*
Directly below an openable, above an opening or
horizontal to an opening i.e. air brick, opening
window or other , etc
Table R.1. Terminal position for a fan assisted concentric flue (see fig. R.6)
1)
In addition, the terminal should not be nearer
than 150 mm to an opening in the building fabric
formed for the purpose of accommodating a built-in
element such as a window.
* BS 5440-1 It is recommended that a fanned flue
terminal should be positioned as follows: a) at least
2 m from an opening in a building directly opposite,
and b) so that the products of combustion are not
directly directed to discharge across a boundary.
