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3.3.2
FLUE LENGTH GUIDE
Flue length range (mm) Cut
130 - 265
350 - 570
570 - 790
790 - 1300
1300 - 1520
1520 - 2250
2250 - 2470
2470 - 3200
3200 - 3420
3420 - 4150
4150 - 4370
4370 - 4600
Table 9
Flue extension guidance up to 4600mm
FLUE BENDS
NOTE: EFFECTIVE LENGTH
B Each flue bend is rated as a certain
straight length of flue, refer to table 10
below. The "effective length" of each
bend is added to the straight length of
flue. Adding bends to the flue system
reduces the actual flue length available.
The effective length of the flue must not
exceed that stated in the relevant
appliance Installation, commissioning
and service manual.
Effective length in metres
Si, i junior,
Bend
i System & Ri
90°
2
45°
1
Table 10
90° BENDS
Figure 6 shows the actual length added by a 90° bend
when used in either orientation.
Fig. 6
90° Bend offset dimensions
6 720 644 842b (2010/12)
Number of extensions
YES
None
NO
None
NO
None
YES
1
NO
1
YES
2
NO
2
YES
3
NO
3
YES
4
NO
4
YES
5
CDi
1.5
0.75
6720644842-04.1Wo
45° BENDS
This application can only be used with the
Si, i Junior and i System boilers.
Figure 7 shows a possible application for a 45° bend
that could be used if fluing from the right or left from the
boiler. In this application the flue would be 100mm
closer to the wall.
189 mm
1
Fig. 7
45° Bend offset dimensions
ADJUSTING THE TELESCOPIC FLUE LENGTH,
STANDARD OR LONGER VERSION
570 mm
350 mm
2
Fig. 8
Standard telescopic flue
Extend tube (1) by withdrawing from tube (2) to achieve
the flue length required, between 350- 570mm.
If using the "longer" telescopic flue, extend tube (1) by
withdrawing from tube (2) to achieve the flue length
required, between 570- 790mm.
790 mm
570 mm
2
Fig. 9
Longer telescopic flue
Secure with screw provided and seal joint with the
aluminium tape supplied.
PRE-INSTALLATION
WALL
100 mm
6720644842-06.1Wo
L
1
6720643895-30.1Wo
L
1
6720644842-34.1Wo
9
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