8.0 Installation
20
8.6
Fitting The Flue
Before fitting the flue, check the condensate
drain integrity (see section 8.5).
IMPORTANT:
The flue should always be
installed with a 3° (1 in 20) fall from terminal to
elbow, to allow condensate to run back to the
boiler.
HORIZONTAL FLUE
1. The standard flue is suitable for lengths 270mm
minimum to 800mm maximum (measured from the
edge of the flue elbow outlet).
Rear Flue:
maximum wall thickness - 630mm
Side Flue:
maximum wall thickness - 565mm (left or right)
2.
For rear exit
- measure the wall thickness
(Fig. 26) and to this dimension add 245mm. This
dimension to be known as (X).
i.e.
(X) = wall thi 245mm
3. Take the flue and mark off (X) from the terminal
end as indicated in the diagram (Fig. 27).
Check your dimensions.
The flue tubes are fixed together. Cut through both
tubes whilst resting the flue on the semi-circular
packing pieces. Deburr both tube ends.
4.
For left hand exit
- measure the distance from
the edge of the wall plate to the inner face of the
wall (Fig. 26) and to this dimension add the wall
thi 275mm. This dimension to be known
as (Y).
i.e.
(Y) = wall plate to wall + wall thi 275mm
5. Take the flue and mark off (Y) from the terminal
end as indicated (Fig. 27).
6.
For right hand exit -
measure the distance from
the edge of the wall plate to the inner face of the
wall and to this dimension add the wall thi
350mm. This dimension to be known as (Z).
i.e.
(Z) = wall plate to wall + wall thi 350mm
7. Take the flue and mark off (Z) from the terminal
end as indicated (Fig. 27).
Check your dimensions.
The flue tubes are fixed together. Cut through both
tubes whilst resting the flue on the semi-circular
packing pieces. Deburr both tube ends.
IMPORTANT:
Check all measurements before
cutting. When cutting ensure the cut does not
interfere with the inner flue support bracket
(Fig. 27a).
360° Orientation
Inner Flue Support Bracket
Wall Thickness
Y
Edge of Wall Plate to Wall
Wall Thickness
(Y) = Left Exit
(Z) = Right Exit
(X) = Rear Exit
Flue
Waste
Fig. 26
Fig. 27
Fig. 27a
3°
(1 in 20)
X
