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Installation
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6 720 643 068 (2011/06)
5.8.3
Vent and combustion air pipe lengths
3" (76 mm) Vent and combustion air pipe
For all installation situations and for all appliances the
maximum vent and combustion air pipe length is 100 feet
each, with no more than 8 elbows each.
2" (50 mm) Vent and combustion air pipe
The maximum combined vent and
combustion
air pipe
length (
Æ
tab. 21, 22 and 23) depend on the installation
situation, the appliance type and the number of elbows
used.
Installations
Æ
Fig. 27, 28, 29, 31, 32 and 34
Separate terminations
2" PIPE
Maximum combined pipe length
including elbows in feet (m) for
Number of
elbows
ZBR16-3A
ZBR28-3A
ZWB28-3A
ZBR35-3A
ZBR42-3A
ZWB42-3A
1
81 ft (24.6 m)
65 ft (19.8 m)
2
76 ft (23.1 m)
57 ft (17.3 m)
3
71 ft (21.6 m)
48 ft (14.6 m)
4
66 ft (20.1 m)
40 ft (12.2 m)
5
61 ft (18.6 m)
32 ft (9.8 m)
6
56 ft (17.1 m)
23 ft (7.0 m)
Tab. 21 Vent and combustion air pipe lengths with
2" diameter and separate terminations
Installations
Æ
Fig. 30 Stainless steel wall termination
2" PIPE
Maximum combined pipe length
including elbows in feet (m) for
Number of
elbows
ZBR16-3A
ZBR28-3A
ZWB28-3A
ZBR35-3A
ZBR42-3A
ZWB42-3A
1
76 ft (23.1 m)
60 ft (18.3 m)
2
71 ft (21.6 m)
52 ft (15.9 m)
3
66 ft (20.1 m)
43 ft (13.1 m)
4
61 ft (18.6 m)
35 ft (10.7 m)
5
56 ft (17.1 m)
27 ft (8.2 m)
6
51 ft (15.6 m)
18 ft (5.5 m)
Tab. 22 Vent and combustion air pipe lengths with
2" diameter and the stainless steel wall termination
Installations
Æ
Fig. 33 Concentric termination
2" PIPE
Maximum combined pipe length
including elbows in feet (m) for
Number of
elbows
ZBR16-3A
ZBR28-3A
ZWB28-3A
ZBR35-3A
ZBR42-3A
ZWB42-3A
1
66 ft (20.1 m)
47 ft (14.3 m)
2
61 ft (18.6 m)
38 ft (11.6 m)
3
56 ft (17.1 m)
30 ft (9.1 m)
4
51 ft (15.6 m)
22 ft (6.7 m)
5
46 ft (14.1 m)
13 ft (4.0 m)
6
41 ft (12.5 m)
5 ft (1.5 m)
Tab. 23 Vent and combustion air pipe lengths with
2" diameter and the concentric termination
