Vent Length Requirements; Maximum Exhaust Vent Pipe Length Vertical And Air Intake Pipe Length Vertical - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Vitodens Rigid and Flex Venting Systems Installation

Vent Length Requirements

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

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
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, B2HB 45, 57
WB2B 80, 105, B2HA 80, 88, 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.
Direct Venting (Two-pipe System)
Vertical Vent Installation
Vitodens 200-W WB2B 45, 60, 80, 105 and
B2HA 45, 60, 80, 88, 100, 112, 150, B2HB 45, 57
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)
System Ø Max. combined equivalent vent length
See note below (a+b)
2 in. (50 mm) 65 ft. (20 m)
3 in. (80 mm) 123 ft. (37 m)
4 in. (100 mm) 150 ft. (46 m)
2 in. (50 mm) 84 ft. (26 m)
3 in. (80 mm) 111 ft. (34 m)
4 in. (100 mm) 135 ft. (41 m)
3 in. (80 mm) 74 ft. (23 m)
4 in. (100 mm) 111 ft. (34 m)
4 in. (100 mm) or 98 ft. (30 m)
4.3 in. (110 mm)
4 in. (100 mm)* 98 ft. (30 m)
5 in. (125 mm)** 98 ft. (30 m)
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