KIT A + TELESCOPIC HORIZONTAL WALL
TERMINAL (C13) - PART NO. 956120
2.5.1
KIT B VERTICAL CONCENTRIC FLUE
TERMINAL (C33) - HBL PART 956081
2.5.2
Traditional concentric flue system, Figure 3a, with a maximum length
of 10m*. The flanged flue elbow is designed with 3° slope towards the
appliance so that the condensate can easily drain off. It has to be
considered that for every metre horizontal flue length the terminal exit
centreline is approx. 45 mm higher than the elbow’s centreline. The
standard telescopic terminal is 615mm max length and 430mm min
length, but can be cut to a minimum flue length of 250mm, which is
suitable for single, 100mm (4"), brick walls.
Standard concentric (ø100/60) vertical flue application, Figures 3b, 3c,
through roof attics with a maximum length of 12m*. The kit comprises
of the roof terminal, vertical adaptor with sampling point and bracket.
The maximum length is measured from the top of the appliance casing
to the underside of the air cowl.
The maximum length is measured from the top of the appliance casing
to the underside of the air cowl.
For installation details refer to the flue kit instructions.
* Note: Flues which exceed 7mtrs in length will be subject to a small
percentage decrease in heat input (below the standard tolerance) as
shown in graph ‘A’ below.
3a
3b
5
3c
a
b
Roof terminal
with rain
cover and
pitched roof
flashing kit.
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
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.
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
SINGLE PAGES 20/9/10 09:59 Page 7
