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

Direct Venting (Two-pipe System)
Vent Length Requirements

Maximum exhaust vent pipe length vertical and air intake pipe length horizontal

Fig. 13 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
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
Table 7. Maximum allowable equivalent length
Boiler Model
WB1B 26, 35
WB2B 19, 26, 35, B2HA 19, 28, 35, B2HB 19, 26, 35
B2TA 19, 35, B2TB 19, 35
WB2B 45, 60, B2HA 45, 60
WB2B 80, 105, B2HA 80, 100, 112
B2HA 150
* 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.
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.
20
(continued)
Fig. 14 Vitodens 200-W WB2B 45, 60, 80, 105,
System Ø
See note below
2 in. (50 mm)
3 in. (80 mm)
4 in. (100 mm)
2 in. (50 mm)
3 in. (80 mm)
4 in. (100 mm)
3 in. (80 mm)
4 in. (100 mm)
4 in. (100 mm) or
4.3 in. (110 mm)
4 in. (100 mm)*
5 in. (125 mm)**
Flexible Venting Installation
B2HA 45, 60, 80, 100, 112, 150
Max. combined equivalent vent length
(a+b)
65 ft. (20 m)
123 ft. (37 m)
150 ft. (46 m)
84 ft. (26 m)
111 ft. (34 m)
135 ft. (41 m)
74 ft. (23 m)
111 ft. (34 m)
98 ft. (30 m)
98 ft. (30 m)
98 ft. (30 m)