Viessmann Flue gas system Installation Instructions Manual page 18

Routing through a duct (cont.)
11. Push on weather collar
safety rope on the lower part.
8
12. Only for balanced operation: Trim the
last ventilation pipe of the connecting
line so that it reaches to the internal wall
of the duct.
13. Balanced flue operation: Push on
balanced flue wall bezel
against the duct opening.
Open flue operation: Push on ventilation
bezel and push it against the duct
11
opening.
Note
The gap created is designed to provide
secondary ventilation for the duct.
An additional ventilation grille is not
required.
Open flue operation with combustion air
supply via interconnected rooms:
Push the flue pipe (suitably trimmed
to size) onto the support bend, push
on room interconnection bezel
secure it on the duct.
and secure
7
and push it
10
and
12
17