Maximum Vent/Air Intake Pipe Length - Vertical - Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual

Direct Venting (Two-pipe System)
Vent Length Requirements
Maximum vent/air intake pipe length - horizontal
(continued)
Exhaust/Air intake
pipe and fittings
field supplied
Fig. 51 Vitodens 200-W WB2B 45, 60, 80, 105
IMPORTANT
For PP(s) systems, all exhaust vent and air intake piping
and elbows exposed outside, must be UV resistant
polypropylene (supplied by the vent manufacturer).

Maximum vent/air intake pipe length - vertical

Table 25 Maximum allowable equivalent length - vertical
Boiler Model
WB1B 26, 35
g
WB2B 19, 26, 35
g
WB2B 45, 60
g
WB2B 80, 105
g
1
* 2 in. to 3 in. or 2 in. to 4 in. increaser field supplied.
2
* See figure 52 and 53.
52
(continued)
Starter adaptor
Parallel adaptor
Boiler adaptor
System Ø See note below
2 in. (51 mm)
3 in. (76 mm)*
1
4 in. (102 mm)* 1
2 in. (51 mm)
3 in. (76 mm) *
1
4 in. (102 mm)* 1
3 in. (76 mm)
4 in. (102 mm)* 1
4 in. (102 mm)
Rigid Venting Systems Installation Instructions
A
a
b
Legend
A Support system
B Exhaust pipe termination with screen
C Combustion air intake with screen
a Equivalent vent length (exhaust)
b Equivalent vent length (air intake)
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
lengths. See table 25 as well as fig. 52 and 53 for
reference. All PP(s) vent material and air intake (if PP(s)
used) must be ULC S636 listed, manufactured by M&G
(Muelink & Grol b.v.) / DuraVent
Max. combined equivalent vent length (a+b)*
86 ft. (31 m)
164 ft. (50 m)
200 ft. (61 m)
115 ft. (35 m)
148 ft. (45 m)
180 ft. (55 m)
98 ft. (30 m)
148 ft. (45 m)
131 ft. (40 m)
Side wall
Caulk here
Exterior caulking
B
Flue
C
Air
2