Supplied By www.heating spares.co Tel. 0161 620 6677
Horizontal flues (C
33
) up to 10m in length, or equivalent, may be used,
however a reduction in the heat input will occur. The graph shows
details.
102.0
101.0
100.0
99.0
98.0
97.0
96.0
95.0
94.0
93.0
92.0
0
1
2
3
4
5
6
7
8
9
10
11
Flue Length (m)
Heat input (%
)
Reduction in heat input as flue length increases
GRAPH A
Fig 3(c) Offset vertical flue.
‘a’ measured from boiler flue outlet centre line to the centre line of
the extension elbow.
‘b’ measured from the top of the boiler to the underside of the air cowl.
Maximum allowable length of a + b = 8900mm
3c
a
b
Roof
terminal with
rain cover
and pitched
roof flashing
kit.
KIT C: HORIZONTAL ANTI-PLUME
FLUE KIT (C13) - PART NO. 956084
2.5.3
If the standard horizontal terminal is likely to cause nuisance to a
neighbour or buildings, because of excess pluming, then this particular
flue kit raises the flue gas outlet point to a higher elevation with the
minimum amount of changes. The flue gas duct is teed-off from the
concentric part and covered by an 80mm outer tube to protect the flue
duct from freezing. The air in-take remains at the lower level (see
Figure 3d).
If choosing this option then the external flue duct length should be
taken into account when calculating equivalent flue length.
For installation details refer to the flue kit instructions.
Dimensions from vertical terminals to opening
windows should be in line with Figure 5.
3d
KIT D EXTERNAL VERTICAL FLUE - (C33)
PART NO. 956085
2.5.4
3e
Suitable for installations if the appliance can’t be repositioned
and where other horizontal flue options may cause some nuisance to
neighbours or buildings. The flue kit contains some additional 45°
elbows and extension ducts as well as a special wall bracket to pass the
guttering (see Figure 3e). The concentric flue will be routed vertically
alongside the outside wall to above the roofline. Special seals are required
to prevent rainwater penetrating the pipe joints.
For installation details refer to the flue kit instructions.
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751030 MANUAL (NEW) 21/9/10 08:41 Page 14
