Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual page 44

Direct Venting (Two-pipe System)
Vent Length Requirements
Maximum vent/air intake pipe length - horizontal
(continued)
Exhaust/Air intake
pipe and fittings
field supplied
Vitodens 200-W WB2B 45, 60, 80, 105,
B2HA 45, 60, 80, 88, 100, 112, 150, B2HB 45, 57
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)
Maximum allowable equivalent length - vertical
Boiler Model
WB1B 26, 35
WB2B 19, 26, 35, B2HA 19, 28, 35, B2TA 19, 35
B2HB 19, 26, 35, B2TB 19, 35
WB2B 45, 60, B2HA 45, 60, B2HB 45, 57
WB2B 80, 105, B2HA 80, 88, 100, 112
B2HA 150
* 1 2 in. to 3 in. or 2 in. to 4 in. increaser field supplied.
* 2 See illustration above
* 3 Due to higher exhaust vent pipe resistance, there is an automatic input reduction of 9% for model B2HA 150
when a 4 inch diameter vent pipe is used.
* 4 4 in. to 5 in. increaser field supplied.
44
(continued)
A
Starter adaptor
Parallel adaptor
Boiler adaptor
System Ø
See note below
2 in. (51 mm)
3 in. (76 mm
4 in. (102 mm)*
2 in. (51 mm)
3 in. (76 mm)*
4 in. (102 mm)*
3 in. (76 mm)
4 in. (102 mm)*
4 in. (102 mm)
4 in. (100 mm)*
5 in. (125 mm)*
Vitodens Rigid and Flex Venting Systems Installation
a
b
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
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 below as well as illustrations above for reference.
All PP(s) vent material and air intake (if PP(s) used) must be
ULC S636 listed, manufactured by M&G / DuraVent.
Max. combined equivalent vent length
(a+b)*
98 ft. (30 m)
164 ft. (50 m)
200 ft. (61 m)
1
115 ft. (35 m)
1 148 ft. (45 m)
1 180 ft. (55 m)
98 ft. (30 m)
1 148 ft. (45 m)
131 ft. (40 m)
3 131 ft. (40 m)
4 131 ft. (40 m)
Side wall
Caulk here
Exterior caulking
Flue
C
Air
2
B