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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
6.3 Vent Length
The maximum vent length when using 2" exhaust ducts is 60’. The maximum vent
length when using 3" vent ducts is 150’. The intake duct length can be of equal
length to the exhaust duct length. Both maximum lengths are reduced by the
number of elbows used, as shown in the following table:
Vent
Size
Maximum
Length
Maximum #
of Elbows
Equivalent
Lengths
2" 60' (18 m) 6
Reduce the maximum vent length
accordingly for each elbow used:
Each 90° elbow equates
to 8 linear feet (2.4 m)
of vent
Each 45° elbow equates
to 4 linear feet (1.2 m)
of vent
3" 150' (45 m) 8
Reduce the maximum vent length
accordingly for each elbow used:
Each 90° elbow equates
to 5 linear feet (1.5 m)
of vent
Each 45° elbow equates
to 3 linear feet (0.9 m)
of vent"
Table 13
The maximum length does not include any elbows.
If using a concentric termination as shown on pages 36, count this as
8 linear feet (2.4 m) of vent.
6.4 Connecting the Vent Clip
CAUTION:
To connect the exhaust vent firmly, you must use the vent
clip included with boiler.
To connect the vent clip:
1. Connect the vent clip to the exhaust vent.
Figure 33
2. Connect the exhaust vent and the vent clip to the fl ue connector.
Figure 34
3. Tighten the screws and fi x the vent clip.
Figure 35
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