Direct Venting (Two-pipe System)
53
Vent Length Requirements
(continued)
Maximum vent/air intake pipe length - horizontal/vertical (hybrid system)
The total equivalent length specified for
a two pipe system is the total
combined
length of the exhaust vent
and air intake pipe system. Do not
exceed these maximum lenghts. See
table 37., as well as Figs. 44, 45, and
46 for reference.
Table 37. Maximum allowable equivalent length - vertical
exhaust / horizontal air intake (hybrid)
Boiler Model
System Ø
Max. combined
equivalent
vent length (a+b)
H
WB1A 8-24, 8-30
3” / 76mm
4” / 102mm
*
59ft. / 18m
72ft. / 22m
H
WB2 6-24C, 6-24
3” / 76mm
4” / 102mm
59ft. / 18m
71ft. / 21.6m
H
WB2 8-32
3” / 76mm
4” / 102mm
44ft. / 13.5m
57ft. / 17.1m
H
WB2 11-44
4” / 102mm
(for larger Ø system
consult Viessmann)
59ft. / 18m
H
WB2 15-60
4” / 102mm
(for larger Ø system
consult Viessmann)
44ft. / 13.5m
*
4” (3” to 4” increaser field supplied. Do not order Viessmann 4” parallel adaptor)
Maximum of five 90° elbows allowed in the
entire
vent and air intake system. See Fig. 47.
Minimum vent length is 3.3 ft. / 1m.
Legend
Support system
Flashings
Exhaust (straight coupling) with
screen
Combustion air intake with screen
a
Equivalent length (exhaust)
b
Equivalent length (air intake)
c
min. 18” / max. 48”
5
2
8
5
2
6
8
v
3
.8
Flue
Air
Support
system
Support
system
Support
system
a
b
Fig. 46
c
Содержание Vitodens 100-W WB1A-24
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