Vent Length Requirements - Viessmann Vitodens 100-W WB1A-24 Installation Instructions Manual

Vent Length Requirements

Maximum vent length (Vitodens 100-W and 200-W boilers)
*1
Fig. 12
Equivalent vent length calculation
87º elbow
Vent pipe (3.3 ft./1 m)
Vent pipe (1.6 ft./0.5 m)
Vent termination
*1
First elbow not included in equivalent
.
vent calculation
Table 7.
Boiler model 60/100
WB1A 8-24 20 ft. / 6m
WB1A 8-30
(see Fig. 12)
WB2 6-24C n.a.
WB2 6-24
WB2 8-32
WB2 11-44 n.a.
WB2 15-60
*1
If used with increasers 60/100 to 80/125.
*2
If used with increasers 60/100 to 100/150.
*3
If used with increasers 80/125 to 100/150.
Side Wall Vent Installation
Vent system
80/125
*1
26 ft. / 8m 33 ft. / 10m
(see Fig. 13) (see Fig. 13)
20 ft. / 6m 26 ft. / 8m
(see Fig. 12) (see Fig. 14)
n.a. 20 ft. / 6m
(see Fig. 12)
H For maximum equivalent vent length
on all models see tables 7. and 8.,
and Figs. 12 (left), 13 and 14 on the
following pages.
H Do not exceed the maximum vent
length.
H Do not use more than five elbows
(87º or 45º) within one vent system
(first elbow is included in count).
H First 87º elbow on boiler is not
included in equivalent vent length
calculation.
Table 8.
Type of fitting Equivalent
length
87º elbow/ 1.6 ft./0.5 m
87º inspection tee
45º elbow 1 ft./0.3 m
Equivalent vent length calculation
example
2 x 87º elbow
. . . . . . . . . . . . . . . . . . . . . . . . . . .
2 x vent pipe (1 m)
. . . . . . . . . . . . . . . .
1 x vent pipe (0.5 m)
. . . . . . . .
1 x vent termination 2.4 ft./0.73 m
. . . . . . .
Total equivalent length 13.8 ft./4.23 m
IMPORTANT
First elbow not included in equivalent
vent calculation.
Always include vent termination length
in calculations.
100/150
*2
*3
3.2 ft./1 m
6.6 ft./2 m
1.6 ft./0.5 m
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