Recommended Venting Practice; Ceiling / Roof Opening - Viessmann Vitodens 200-W WB2B Series Installation Instructions Manual

Vitodens Rigid and Flex Venting Systems Installation
General Flex Venting Installation
Exhaust vent installation steps (continued)
Once the bottom of the flex pipe and adaptor has

reached the desired position, insert into the support
elbow/support strip assembly.
Choose the required size and install the galvanized wall

sleeve (cut to the width of the wall if required) and seal
the space between the sleeve and the wall with mortar.
Proceed with installing the rigid pipes and wall plate.

Start from the chimney support elbow to the boiler
adaptors (rigid pipes can be cut to the correct length if
required).
Seal the top wall of the chimney with a water resistant

sealant.
IMPORTANT
When cutting rigid pipes to length, debur and clean pipes.
For flexible vent systems:

In conjunction with these instructions, follow the
installation instructions supplied by the special venting
manufacturer.
(continued)

Recommended venting practice

When installing a venting system the following
recommended venting practices apply:
Keep length and number of 90º elbows to a minimum.

Try not to use back-to-back 90º elbows.

Use 45º elbows where possible to minimize the number

of 90º elbows in case redirection of flue gas is required.

Ceiling / roof opening

Cut an opening for the vent pipe. Size opening at least
1 in. (25 mm) larger than vent pipe diameter (for
combustible as well as non-combustible material).
General Information
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