3
2.1. TERMINAL ASSEMBLY
The overall height of the terminal assembly is 1100mm.
Note. A minimum of 300mm shall extend above the surface
of the roof. Refer to Fig. 2.
2.2. NOMINAL FLUE HEIGHT (NO OFFSET).
The maximum equivalent flue heights, ex
cluding the flue
terminal assembly are:
Table 2.
24i, 28i, 35CDi II 2.3m
WR325, WH1 2.6m
25Si, 28Si, C1 3.0m
15SBi, 24SBi, 24CDi, 80ic 4.0m
9/14, 14/19CBi 3.0m
19/24CBi 2.25
28CDi 3.5m
Highflow 400 Electronic 4.5m
2.3. FLUE WITH OFFSET USING TWO FLUE BENDS.
A flue offset can be provided using, 2 at 90° (except for WH1
and WR325 RSF water heaters where 90° bends cannot
be used) or 2 at 45° bends.
When using an offset the overall length of the system is
reduced.
A 90° bend is equivalent to 750mm of straight flue.
A 45° bend is equivalent to 375mm of straight flue.
Note: For the 24i, 28i and 35CDi II 2 x 90° bends allows a
maximum straight length to not exceed 800mm or 1550mm
for 2 x 45° bends.
When measuring between the centre-lines of flue ducts an
allowance must be made for the relevant elbow. Refer to Fig. 3.
75mm
MODEL
15SBi 79mm
NONE
NONE24SBi
EQUIVALENT
FLUE LENGTHS
UP TO 1M
EQUIVALENT
FLUE LENGTHS
1M TO 4M
EQUIVALENT
FLUE LENGTHS
UP TO 725MM
EQUIVALENT
FLUE LENGTHS
725MM TO 3M
C1 & Si Series 79mm
NONE
9/14CBi
14/19CBi
72mm
79mm
NONE
NONE19/24CBi
WR325 RSF
WH1
24CDi NONE
28CDi NONE
TERMINAL
ASSEMBLY
ONLY
EQUIVALENT
FLUE LENGTHS
UPTO MAX LENGTH
1.414D - 60
D
D
D - 162
NONE
UP TO 2600mm
IMPORTANT: The flue terminal assembly must always be
vertical at the roof outlet.
2.4. FLUE RESTRICTOR RINGS
The flue restrictor rings are in the appliance installation pack.
Refer to the relevant Installation/service instructions for the
method of fitting a restrictor ring.
Fig. 3. Flue Offset
Fig. 4. Example of vertical flue assembly showing
equivalent straight flue lengths
Table. 3.
30
30
Minimum 76mm
35CDi II
NONE
UP TO 1m
1m-2.3m
85
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