15
– 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.
– Where the lowest part of the terminal is fitted less than 2 m
(78 in) above ground, above a balcony or above a flat roof to
which people have access, the terminal MUST be protected by
a purpose designed guard.
– Where the terminal is fitted within 850 mm (34 in) of a plastic
or painted gutter, or 450 mm (18 in) of painted eaves, an alu-
minium shield at least 1,500 mm (59 in) long must be fitted to
the underside of the painted surface.
– The air inlet/outlet flue duct MUST NOT be closer than 10 mm
(0.4 in) to combustible material.
– In certain weather conditions the terminal may emit a plume of
steam. This is normal but positions where this would cause a
nuisance should be avoided.
Terminal position
Minimum spacing
A
Directly below an openable window, air vent
or any other ventilation opening
300 mm
12 in
B
Below guttering, drain pipes or soil pipes (*)
75 mm
3 in
C/D
Below eaves, balconies or carport roof
200 mm
8 in
E
From vertical drain pipes or soil pipes
75 mm
3 in
F
From internal or external corners
300 mm
12 in
G
Above adjacent ground, roof or balcony level
300 mm
12 in
H
From a boundary or surface facing the boiler
600 mm
24 in
I
From a terminal facing the terminal
1,200 mm
48 in
J
From an opening in the carport
(eg door, window into dwelling)
1,200 mm
48 in
K
Vertically from a terminal on the same wall
1,500 mm 60 in
L
Horizontally from a terminal on the same wall
300 mm 12 in
M
Horizontally from a vertical terminal to a wall
300 mm 12 in
N
Horizontally from an openable window or other opening 300 mm 12 in
P
Above an openable window or other opening
300 mm
12 in
Q
From an adjacent vertical terminal
600 mm
24 in
(*) For condensing boilers this distance can be reduced to 25 mm without effecting boiler per-
formance, but it will be necessary to protect the surfaces from the effects of condensate
TABLE 4
Fig. 6
2.9
SEPARATE PIPES ø 80
(Optional alternative
twin pipe system)
A special kit may be used to separate the
flue gas outlet from the fresh air intake (fig.
7).
The maximum overall length of the intake
and exhaust ducts depends on the head
losses of the single fittings installed
(excluding the doublers) and must not be
greater than 11.5 mm H
2
O (“25 HE -EV”
and “SYSTEM 25 HE -EV” models) and 8.0
mm H
2
O (“30 HE -EV” model).
See
Table 4
for information on the load loss-
es of single accessories and the example of
fig. 7 for information on how to calculate
load losses.
NOTE: Ensure that any accessories are
suitable for condensing boilers.
2.9.1
Separate pipe accessories
Kit code 8089912 is supplied for this pur-
pose (fig. 8).
2.9.2
Separate ducts kit (fig. 8/a)
The diagrams of Figure 8/a show a couple
of examples of the permitted exhausts con-
figurations.
