Maximum Vent/Air Intake Pipe Length - Horizontal/Vertical (Hybrid System) - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Direct Venting (Two-pipe System)
Vent Length Requirements
Maximum vent/air intake pipe length - horizontal/vertical
(hybrid system)
All PP(s) vent material and air intake (if PP(s) used) must
be ULC S636 or UL1738 listed, manufactured by M&G
(Muelink & Grol b.v.) / DuraVent, or Centrotherm.
Maximum allowable equivalent length - vertical exhaust / horizontal air intake (hybrid)
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
* 1 2 in. to 3 in. or 2 in. to 4 in. increaser field supplied.
* 2 See illustration below and on page 47
* 3 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 4 in. to 5 in. increaser field supplied.
Note: For combination of different vent/air intake pipe
diameters, such as Ø 3 in. stainless steel vent with
Ø 2 in. (CVPC, PVC, ABS) air intake pipe, the total
equivalent length must be used for the smaller pipe
diameter.
Minimum vent length is 3.3 ft. (1 m).
Legend
A Support system
B Flashings
C Exhaust (straight coupling) with screen
D Combustion air intake with screen
a Equivalent length (exhaust)
b Equivalent length (air intake)
c min. 18 in. (max. 48 in.)
Vitodens 100-W WB1B 19, 26, 35,
Vitodens 222-F B2TA 19, 35
Vitodens 222-F B2TB 19, 35
Vitodens 200-W WB2B 19, 26, 35,
Vitodens 200-W B2HA 19, 28, 35
Vitodens 200-W B2HB 19, 26, 35
46
Vitodens Rigid and Flex Venting Systems Installation
(continued)
The total equivalent length specified for a two pipe system
is the total combined length of the exhaust vent and air
intake pipe system. Do not exceed these maximum
lengths. See table and illustration below and illustration on
page 47 for reference.
System Ø
See note below
2 in. (51 mm)
3 in. (76 mm)*
4 in. (102 mm)*
2 in. (51 mm)
3 in. (76 mm)*
4 in. (102 mm)*
3 in. (76 mm)
4 in. (102 mm)*
4 in. (102 mm)
4 in. (100 mm)*
5 in. (125 mm)*
Flue
Max. combined equivalent vent length
(a+b)*
98 ft. (30 m)
1 164 ft. (50 m)
1 200 ft. (61 m)
115 ft. (35 m)
1 148 ft. (45 m)
1 180 ft. (55 m)
98 ft. (30 m)
1 148 ft. (45 m)
131 ft. (40 m)
3 131 ft. (40 m)
4 131 ft. (40 m)
2
Air