Viessmann Vitodens 200-W Installation Instructions Manual page 17

Flue system
(cont.)
Concentric Vertical Flue System
The vertical flue kit option with extensions
may be used for up to 10m total flue
length.
An extra 87° elbow can be used but this
reduces the maximum permissible length
by 1m. An extra 45° elbow can be used
but this reduces the maximum permissible
length by 0.5m.
A
Combined length of flue pipe max.10m.
Before commencing the installation refer to
diagram below to determine which optional
extension kits are required, if any.
B
Flue pipe (can be shortened as necessary)
17