17
Alpha CD50 - Installation
Fig. 20 - Rear flue
4.7 EXTENDING THE FLUE - Fig. 21
Note: The maximum horizontal flue assembly length must not exceed a length of 12 metres.
1. When the flue length required is more than the maximum or less than the minimum stated in Section 4.6, paragraph 1,
refer to the table below.
2. Use the template (supplied with the boiler) to mark the required flue position and cut a 130 mm diameter hole for the flue
(use a 127 mm core drill). The size of the hole provides sufficient clearance for the clamps on the flue extension to pass
through the hole.
3. Determine the overall flue length as described in Section 4.6, paragraph 2 to determine the number of Alpha CD 750/1000 mm
flue extensions required.
90
Outer duct clamp
Inner duct seal joint
Inner duct seal joint
90° bend
Terminal
Flue sealing collar
Note: Ensure the outer flue duct is horizontal
Boiler side
CD Easy-Flue
Ensure the inner duct within
the terminal is at the top.
The inner duct must
be positioned to slope towards
the boiler
Note:
140 mm
235 mm
Flue Length
Up to maximum:-
Between:-
Between:-
Between:-
Between:-
Less than above
Rear Flue (B)
11.86 m
665 - 870 mm
20 - 610 mm
225 - 430 mm
20 - 170 mm
Left hand
11.91 m
715 - 920 mm
70 - 660 mm
275 - 480 mm
70 - 220 mm
Comments
Alpha CD 750 mm or 1000 mm flue extension
(Part No. 6.2000750 or 6.2001050) is required to
extend the range of telescopic flue.
Refer to Section 4.7 for instructions on how to extend
the flue.
Note: A 130 mm flue hole (127 mm core drill) is
required in the wall.
Within the standard Easy-Flue 1000 mm
(Part No. 6.2001010) telescopic range.
Discard the first telescopic section of the Easy-Flue
1000 mm (i.e. not with terminal) and cut to the required
length.
Within standard Easy-Flue 500 mm
(Part No. 6.2000510) telescopic range.
Discard the first telescopic section of the Easy-Flue 500
mm (i.e. not with terminal) and cut to the required
length.
Terminal may protrude somewhat from the outside wall.
Side Flue (B + C)
Right hand
11.67 m
475 - 680 mm
20 - 420 mm
35 - 240 mm
N/A
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