3.4.1 Flue Termination
1. The terminal must be positioned
such that the combustion products can
disperse freely at all times.
2. 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.
3. If the terminal is fitted less than 2m
above a balcony, above ground or
above a flat roof to which people
have access, then a suitable guard
must be provided and fitted (available
from Tower Flue Components,
Tonbridge, TN9 1TB: reference TFC
type K3).
Table 1:
Terminal position for fan-assisted flue
(minimum distance - see fig. 5)
A- Directly below an openable
mm
window or other opening
(e.g. air brick)
300
B- Below gutters, soil pipes
or drain pipes
25
C- Below eaves
25
D- Below balconies
25
(below car port roof
200)
E- From vertical drain pipes
and soil pipes
25
F- From internal or external
corners
25
G- Above ground or balcony
level
300
H- From a surface facing a
terminal
600
I- From a terminal facing a
terminal
1200
J- From an opening in a
car port (e.g. door, window)
into a dwelling
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
9
A
BCD
A
G
H, I
F
J
B F
M
L
L
K
K
G
G
F
F
E
fig. 5
GW 595/1
Where a terminal is fitted less than
1m below a plastic gutter or less than
0.5 m below painted eaves or any
other painted surface then a suitable
shield at least 1m long should be
fitted to protect the surface.
Note: Vertical flues must not terminate
within 600 mm of an openable
window, air vent or any other
ventilation opening.
