Direct Venting (Two-pipe System)
51
Vent Length Requirements
Maximum vent/air intake pipe length - horizontal
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 35., as well as Figs. 44, 45, and
46 for reference.
Table 35. Maximum allowable equivalent length - horizontal
Boiler Model
System Ø
Max. combined
equivalent
vent length (a+b)
H
WB1A 8-24, 8-30
3” / 76mm
4” / 102mm
*
52ft. / 16m
66ft. / 20m
H
WB2 6-24C, 6-24
3” / 76mm
4” / 102mm
52ft. / 16m
63ft. / 19.2m
H
WB2 8-32
3” / 76mm
4” / 102mm
40ft. / 12m
50ft. / 15.2m
H
WB2 11-44
4” / 102mm
52ft. / 16m
H
WB2 15-60
4” / 102mm
40ft. / 12m
*
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 systems
(first 90º elbows are not included). See Fig. 47
Minimum vent length is 3.3 ft. / 1m.
Legend
Support system
Exhaust pipe termination with
screen
Combustion air intake with screen
a
Equivalent vent length (exhaust)
b
Equivalent vent length (air intake)
5
2
8
5
2
6
8
v
3
.8
First elbow not included in equivalent
vent calculation.
Always include vent termination length
in calculations.
IMPORTANT
Vitodens Boiler
a
b
Starter Adaptor
Parallel Adaptor
Boiler Adaptor
Side Wall
Caulk here
(exterior caulking)
Air
Flue
Field Supplied
Exhaust/Air Intake
Pipe and Fittings
Fig. 44
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