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F
2.13
IG
N
: M
L
OTE
AX
ENGTH
b+b = a+a+a+0.5+0.5
C
L
OMBINED
ENGTH NOT
5m
TO EXCEED
F
2.14
IG
= a+a+a +
The Vertical flue kits maximum and minimum useable
lengths with both flat and pitched roof flashings are
indicated in (Figs. 2.14 & 2.15).
Before proceeding to fit the flue, ensure that the
maximum flue length has not been exceeded and that all
elbows and bends have been taken into consideration,
the maximum flue length is 5 metres, for each additional
90
o
elbow 1 metre must be subtracted from the total flue
length, and for each 45
o
from the total flue length (the offset and height of 2 x
45
o
can be seen in Fig. 2.16).
Mark the position of the flue hole in the ceiling and/or roof
(see F
. 2.14 for distance from wall to the centre of
IG
the flue).
Cut a 125mm diameter hole through the ceiling and/or
roof and fit the flashing plate to the roof.
Should it be necessary to cut the flue DO NOT cut the
outer white air inlet tube, cut the aluminium exhaust flue
6mm longer than the outer white air tube when used at
minimum length. DO NOT cut more that 250mm from the
inner aluminium exhaust flue.
To connect the vertical flue kit directly to the boiler, place
the adaptor (see F
2.12) (supplied with vertical flue kit)
IG
onto the exhaust manifold and secure with the clamp, the
vertical flue kit must then be inserted through the roof
flashing, this will ensure that the correct clearance above
the roof is provided as the terminal is a fixed height.
Should extensions be required, they are available in 1
metre (Part No. 705786), 500mm (Part No. 705790) and
160mm lengths (Par t No. 705812), they must be
connected directly to the boiler and secured with the
clamp supplied before connecting the adaptor to allow the
vertical flue kit to be fitted. In the event that extension
pieces need to be shortened, they must only be cut at
the male end and it must be ensured that the distance
between the inner and outer flue are kept (Fig. 2.10).
When utilising the vertical flue system, action must be
taken to ensure that the flue is supported adequately to
prevent the weight being transferred to the appliance flue
connection.
When the flue passes through a ceiling or wooden floor,
there must be an air gap of 25mm between any part of
the flue system and any combustible material. The use of
a ceiling plate will facilitate this. Also when the flue
passes from one room to another a fire stop must be
fitted to prevent the passage of smoke or fire, irrespective
of the structural material through which the flue passes.
F
F
(T
P
ITTING THE
LUE
WIN
IPE
Where it is not possible to terminate the flue within the
distance permitted for coaxial flues, the twin flue pipe can
be used by fitting a special adaptor to the flue connector
and using the aperture for the air intake located on top of
the combustion chamber.
0.5 metres must be subtracted
)
13
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