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The standard horizontal flue is fitted onto the top of the boiler
using the flue adaptor.
See diagrams 8.1 to 8.3 to determine whether a standard flue
can be used.
The standard flue can be extended using 1m long extension kits
and 90° elbows to maximum equivalent length of 3.5m - Note:
A 90° elbow equals 1m of flue.
When extension pipes are used the flue system must be
designed to have a continuous fall to the boiler of at least 2.5°
to allow condensate to run back into the boiler and out via the
drain.
Horizontal Internal Flue Installation The flue can be installed
from inside the building, when access to the outside wall face is
not practicable.
8.1 Flue Length
All dimensions are in mm.
For a rear flue, measure the distance from the outside wall face
to the boiler mounting wall. Check that the flue length will be
suitable, see diagram 8.1 for a standard flue system.
For a side flue, measure the distance from the outside wall face
to the flue outlet centre line of the boiler. Check that the flue
length will be suitable, see diagram 8.2 for a left hand flue
system or diagram 8.3 for a right hand flue system.
If the measurement exceeds those shown in diagrams 8.1 - 8.3
then one or more extension pipes are required.
8 Horizontal Top Flue Preparation and Fitting
WALL THICKNESS 'X' = 75 TO 527mm
"X"
REAR FLUE - STANDARD
DISTANCE 'Y' = 330 TO 732mm
SIDE FLUE - STANDARD Left
DISTANCE 'Y' = 310 TO 732mm
SIDE FLUE - STANDARD Right
23
Diagram 8.1
"Y"
Diagram 8.2
"Y"
Diagram 8.3
2000225294A
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