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When installing a replacement boiler a new flue
system is delivered with the boiler as original
flue set must be used and re-using the existing
boiler flue installation is strictly not acceptable
Design
Individual air supply and flue outlet pipes are used as
standard. The material approved for this application
which MUST be used are:
Termination Of The Flue And Air
The flue and air pipes may terminate independently
through any external walls within the same dwelling
except on opposing walls, within the maximum lengths
shown in graph below. (Alternatively a vertical flue pipe
termination is acceptable.)
The air pipe must have an elbow and 150 mm length of
pipe directed downwards with a termination grill fitted.
The air pipe can be situated at the side or beneath the flue
pipe to a minimum dimension of 140 mm (see Table.1). It
must not be sited above the flue pipe.
The flue and air pipes must extend by at least 40 mm from
the wall surface.
Condensing boiler emit a visible plume of water vapour
from the flue terminal, this is normal. It is the responsibility
of the installer to judiciously select a terminal location that
does not cause a nuisance.
If either the flue or air terminal is below a height of 2 m
from ground level a terminal guard must be fitted.
Note. Any veritcal termination MUST have the terminals
fitted and the air intake comply with the dimensions
above
305 mm
102 mm
2
1
2
1
1
2
1-
2-
INTAKE
EXHAUST
150 mm
Min.40 mm
Figure 43
TOTAL VERTICAL LENGTH: A+F =32 m
FLUE
OUTLET
F
A
AIR
INTAKE
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
2
4
6
8
10 12
14 16 18
20 22 24 26 28 30 32 34 36
Flue Pipe Length (m)
Air Pipe Length (m)
Acceptable Operating Area
Figure 44
Horizontal Air-Flue Lengths
Table 1
Air Pipe and Flue Pipe Lengths Diagram
Figure 45
Vertical Air and Horizontal Flue Lengths
1,5° slope back
to boiler
AIR
INTAKE
(80 mm)
FLUE
OUTLET
(80 mm)
A
TOTAL HORIZONTAL LENGHT : A+F = 30 m
F
1,5° slope back
to boiler
