Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual page 53

Rigid Venting Systems Installation Instructions
Vent Length Requirements
Maximum vent/air intake pipe length - vertical (continued)
Note: For combination of different vent/air intake pipe
diameters, such as Ø 3 in. stainless steel vent with
Ø 2 in. (PP(s), 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. 52 Vertical Vent Installation Vitodens 100-W and
200-W WB2B 19, 26, 35
IMPORTANT
For PP(s) systems, all exhaust vent and air intake piping
and elbows exposed outside, must be UV resistant
polypropylene (supplied by the vent manufacturer).
(continued)
IMPORTANT
All PP(s) vent termination elbows, must be secured in
place as specified by manufacturer.
Fig. 53 Vertical Vent Installation Vitodens 200-W WB2B
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.
d min. 12 in.
e min. 12 in.
f 6 in. over max. local snow level (check with your local
weather office for details)
Direct Venting (Two-pipe System)
45, 60, 80, 105
53