Vent Length Requirements; Maximum Vent Length - Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual

Vertical Vent Installation (Coaxial)

Vent Length Requirements

Maximum vent length

Table 10
Boiler model a (max.
length)
60/100 vent ft. (m)
system
80/125 vent ft. (m)
system
100/150 or ft. (m)
110/160
vent system
Fig. 26 Vent length "a"
28
WB1B 26, 35 WB2B 19, 26
82 (25) 30 (9)
- -
- -
Rigid Venting Systems Installation Instructions
WB2B 35 WB2B 45
23 (7) -
- 33 (10)
- -
Do not exceed the maximum vent length.
See page 29 for increased diameter equivalent vent pipe
system (see tables 11 and 12).
WB2B 60 WB2B 80,
105
- -
20 (6) -
- 43 (13)