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5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Direct Venting (Two-pipe System)
Vent Length Requirements
(continued)
Maximum exhaust vent pipe length vertical and air intake pipe length horizontal
Legend
a Equivalent length (exhaust)
b Equivalent length (air intake)
Note:
must be 6 in. (152 mm) over max. local snow level
(check with your local weather office for details)
1
Pipe support
Maximum allowable equivalent length
Vitodens 100-W WB2B 26, 35 and Vitodens
200-W WB2B 19, 26, 35, B2HA 19, 28, 35,
B2HB 19, 26, 35 and Vitodens 222-F B2TA 19, 35,
B2TB 19, 35
Vitodens 200-W WB2B 45, 60, 80, 105,
B2HA 45, 60, 80, 88, 100, 112, 150
B2HB 45, 57
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)
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.
* 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.