
88
5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Single Pipe Venting (Room Air Dependent)
Vent Length Requirements
Maximum vent pipe length - vertical
Legend
A
Combustion air intake (left, right or through co-axial
opening), remove and discard air intake cover for
(WB1B 26, 35, WB2B 19, 26, 35, B2HA 19, 28, 35,
B2HB 19, 26, 35, B2TA 19, 35 and B2TB 19, 35)
B
Combustion air opening
a Equivalent vent length (exhaust)
1
Pipe support
Maximum allowable equivalent length - vertical
Adaptors
Increaser / transition adaptors
This boiler adaptor is shown installed
with an increaser adaptor (if required
for 80 mm system) for models WB1B
26, 35, WB2B 19, 26 25, B2HA 19,
28, 35, B2HB 19, 26, 35, B2TA 19,
35 and B2TB 19, 35.
Legend
a 5
b
in. (140 mm)
This boiler adaptor is shown installed
with a required transition adaptor for
models WB2B 80, 105, B2HA 80,
88, 100, 112, 150. Required only
with M&G / Duravent system.
Legend
b 7
b
in. (191 mm)
This boiler adaptor is shown (pre-
installed) for models WB2B 45, 60,
B2HA 45, 60, B2HB 45, 57.
The connecting rigid pipe (PPs) fits
directly into the boiler adaptor.
Legend
c 2
b
in. (64 mm)
Note:
For combination of different vent/air intake pipe
diameters, such as Ø 3 in. (80 mm) PP(s) flexible
vent with Ø 2 in. (50 mm) CVPC, PVC, ABS air
intake pipe, the total equivalent length must be
used for the smaller pipe diameter.
Boiler Model
System Ø
See note below
Max. combined equivalent vent length
(a+b)
WB1B 26, 35
2 in. (50 mm)
3 in. (80 mm)
4 in. (100 mm)
65 ft. (20 m)
123 ft. (37 m)
150 ft. (46 m)
WB2B 19, 26, 35, B2HA 19, 28, 35, B2HB 19, 26, 35
B2TA 19, 35, B2TB 19, 35
2 in. (50 mm)
3 in. (80 mm)
4 in. (100 mm)
84 ft. (26 m)
111 ft. (34 m)
135 ft. (41 m)
WB2B 45, 60, B2HA 45, 60, B2HB 45, 57
3 in. (80 mm)
4 in. (100 mm)
74 ft. (23 m)
111 ft. (34 m)
WB2B 80, 105, B2HA 80, 88, 100, 112
4 in. (100 mm) or
4.3 in. (110 mm)
98 ft. (30 m)
B2HA 150
4 in. (100 mm)*
5 in. (125 mm)**
98 ft. (30 m)
98 ft. (30 m)
* There is an input reduction of 9% for model B2HA 150 when a 4 in. diameter vent pipe is used.
** 4 in. to 5 in. increaser field supplied.