Keston C45 Installation And Servicing Instructions page 20

WD536
Alternatively, where flue or air intake
lengths of up to 45m are require,
Glynwed Friatec DN70 pipe may be
used.
Both 50mm flue outlet terminal and
50mm air inlet terminal are supplied
and are illustrated in Figure 2.8.1.
Both terminals are identical.
flue and air terminals must be fitted
to the appropriate duct using solvent
weld adhesive. If 75mm terminals
are required these can be obtained
from your Keston Boilers stockist.
Request
C.17.2.26.00.0
C.17.2.00.60.0 (50 to 75 adapters).
2.8.2 Maximum Lengths
The maximum lengths of both air inlet pipe and flue outlet pipe, when no bends
are used, are as detailed below.
Maximum Air Inlet Length
Maximum Flue Outlet Length
Maximum Total Flue and Air Intake Length
However, each bend used has an equivalent length that must be deducted from
the maximum straight length stated above. Knuckle bends must not be used.
A 92.5
Example (assuming 50mm muPVC flue and air pipework):
Air inlet uses two 92.5
a+b in figure
2.8.2) = 29.0m
- 1.0m - 1.0m
= 27.0m
Flue outlet
uses one 92.5
sweep elbow.
Hence,
maximum
length
permissible
(i.e. c+d in
figure 2.8.2) =
15.0m - 1.0 m
= 14.0m
Installation & Servicing Instructions
Chapter 2 - Boiler Location
part numbers
(terminals)
o sweep elbow is equivalent to 1.0m straight length.
o
sweep elbows. Hence, maximum length permissible (i.e.
o
Figure 2.8.2 : Flue & Air Maximum Length Example
The Keston C45, C40P, C55 & C55P
The
Flue Outlet/Air Inlet Terminals
and
Figure 2.8.1 : Terminals
:
:
:
AIR
b
a
C45 or C55
50mm 75mm
29.0 m 89.0 m
15.0 m 45.0 m
30.0 m 90.0 m
FLUE
d
c
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