Viessmann Flue gas system Installation Instructions Manual page 20

Routing through a duct (cont.)
Open flue operation
Connecting line to the duct for open flue operation or balanced flue operation with
combustion air supply via interconnected rooms, see "Rigid flue" on page 7 .
Installation
Fit the support bend and the interconnecting pipe, from page 11.
Fitting the pipe lowering attachment and drawing the flexible flue into
the duct
Note
The flexible flue must start with a smooth
n
section at the bottom. If necessary, trim
off a piece of flue pipe.
Draw in the flue exclusively from top
n
to bottom.
Subject to duct size, insert spacers at a
n
distance of up to 2 m.
Arrange a spacer before and after any
n
deviation and any inspection piece.
The flue must not contact the duct wall.
n
1. Remove union ring
from the adaptor (from the standard
2
duct set).
2. Push union ring
1
3. Place retaining ring
groove of flexible flue
4. Fit union ring to pipe lowering
1
attachment and fit the rope.
4
and retaining ring
1
onto flexible flue
3
into the second
2
.
3
.
19