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5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Direct Venting (Two-pipe System)
Vent Length Requirements
Maximum exhaust vent pipe length vertical and air intake pipe length vertical
Legend
a Equivalent length (exhaust)
b Equivalent length (air intake)
c 6 in. (152 mm) over max. local snow level
(check with your local weather office for details)
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)
Maximum allowable equivalent length
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.
Vertical Vent Installation
Vitodens 100-W WB1B 26, 35
Vitodens 200-W WB2B 19, 26, 35,
Vitodens 200-W B2HA 19, 28, 35
Vitodens 200-W B2HB 19, 26, 35
Vitodens 222-F B2TA 19, 35
Vitodens 222-F B2TB 19, 35
Vertical Vent Installation
Vitodens 200-W WB2B 45, 60, 80, 105 and
B2HA 45, 60, 80, 88, 100, 112, 150, B2HB 45, 57
* 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 in. to 5 in. increaser field supplied.
