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Pre-Installation
3
Pre-Installation
3.1
Typical installations
WARNING:
Open flue
▶ Open (conventional) flued appliances must not be installed in
bedrooms, bathrooms or bedsitting rooms
▶ Inspection points must be provided for access to check the flue
system joints.
Before starting installation, check that:
• the chimney is structurally sound and free from obstructions
• the chimney has been swept to remove deposits since the last use
This flexible flue pipe is only suitable for lining chimneys that conform to
the Building Regulations and it should not be used as a chimney on its
own or outside a masonry or flue block chimney.
All the flexible liner and adaptors must be within the chimney, with rigid
stainless steel flue pipe connecting to the boiler.
The first 600mm of the stainless steel flue pipe from the boiler must be
vertical with no bends or restrictions.
There must be a least a 25mm clearance between the S/S flue pipe and
any combustible material.
The data label must be secured onto the chimney or chimney hearth
using the plate provided.
If it is not possible to attach the plate to the chimney, the plate can be
attached, in a visible position, next to the electricity consumer unit.
Do not attach the data plate or label to the flue system.
The terminal should not be modified and an extra cowl or cover must not
be fitted, the boiler is designed so that any rain that enters the flue will
be directed down to the condensate drain.
Calculating the flue length
Refer to figure 8 and table 2
L max = boiler max minus 1 metre*.
(Each 45° bend has a 0.5 metre equivalent flue length).
* If the chimney has an additional offset, then L will be reduced by an
extra metre.
** The top 45° bend may not be required if there is sufficient room in the
chimney to turn the flexible liner through 45° within the chimney. The
stainless steel section must be adequately supported.
# Maximum flue length without damper is 6 metres
Greenstar boiler
Model FlueØ
models
Camray kitchen
12/18
18/25
25/32
Camray Utility & Utility
12/18
System
18/25
25/32
Danesmoor (pre 2011) 18/25
Heatslave
12/18
18/25
25/32
Utility
18/25
32/50
50/70
8
Max flue
Damper
mm
length (m)
required >6m
100
15
N
100
15#
Y
100
15#
Y
100
15
N
100
15#
Y
100
15#
Y
100
15
N
100
15
N
100
15
N
100
15
N
100
15
N
100
15
N
100
15
N
Greenstar boiler
Model FlueØ
models
Heatslave II
12/18
18/25
25/32
Danesmoor
12/18
(cross firing post 2013)
18/25
25/32
Table 2 Max flue lengths
1
2
4
5
MIN
600mm
7
Fig. 8
Typical installation - offset flue
[1]
Chimney cowl
[2]
Flexible liner
[3]
Centralising spacer
[4]
Fire stop/Inspection plate
[5]
Maximum two bends at 135°
[6]
Stainless steel vertical section (minimum 600mm)
[7]
Boiler
Greenstar Oilfit Flexi CF Flue – 6720807911 2019/05
Max flue
Damper
mm
length (m)
required >6m
100
12
N
100
12
N
100
12
N
100
12
N
100
12
N
100
12
N
MAX
L
3
**
6
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