Maximum Vent/Air Intake Pipe Length - Horizontal/Vertical (Hybrid System) - Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual

Rigid Venting Systems Installation Instructions
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.
Table 26 Maximum allowable equivalent length - vertical exhaust / horizontal air intake (hybrid)
Boiler Model
WB1B 26, 35
g
WB2B 19, 26, 35
g
WB2B 45, 60
g
WB2B 80, 105
g
1
* 2 in. to 3 in. or 2 in. to 4 in. increaser field supplied.
2
* See figure 56 and 57.
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).
Fig. 56 Vitodens 100-W and 200-W WB2B 19, 26, 35
(continued)
System Ø See note below
2 in. (51 mm)
3 in. (76 mm)* 1
4 in. (102 mm)* 1
2 in. (51 mm)
3 in. (76 mm)* 1
4 in. (102 mm)*
1
3 in. (76 mm)
4 in. (102 mm)*
1
4 in. (102 mm)
Flue
Direct Venting (Two-pipe System)
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 26, as well as fig 56 and 57 for reference.
Max. combined equivalent vent length (a+b)*
86 ft. (31 m)
164 ft. (50 m)
200 ft. (61 m)
115 ft. (35 m)
148 ft. (45 m)
180 ft. (55 m)
98 ft. (30 m)
148 ft. (45 m)
131 ft. (40 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.)
2
Air
55