Installation guide

Direct Venting (Two-pipe System)
47
Vent Requirements - Stainless Steel
Additional requirements for stainless steel vent pipe material
Use an AL29-4C® special stainless
steel venting system (UL/ULC listed for
category IV) for horizontal or vertical
venting of the Vitodens boilers.
See tables 35 and 36, and contact one
of the suppliers (see listing on right) to
order.
Prior to installation, check that the
correct single-wall vent parts were
ordered and supplied.
See table 38 for special parallel/starter
adaptor and bird screen models
required for your installation. In case of
discrepancies, contact original parts
supplier.
Exhaust vent/air intake connection to
boiler
The vent connection to the Vitodens
boiler must be made with the starter
stainless steel adaptor (supplied by
others and/or parallel adaptor see table
38). The starter adaptors are intended
for a slip fit and slide into the parallel
adaptor with a gentle twisting motion.
Combustion air intake pipe:
If the venting system will use
CPVC/ABS, PVC plastic pipe for
combustion air intake, a CPVC starter
adaptor for use on air intake
connection to parallel adaptor must be
ordered from Viessmann (see table
38.).
The bird screen for the air intake
termination elbow must also be ordered
from Viessmann.
Note:
The Vitodens boiler has passed the
zero inches vent clearance to
combustibles testing requirements
dictated by the Harmonized Standard
ANSI Z21.13. CSA 4.9.2005 and
therefore is listed for zero clearance to
combustibles when vented with a
single wall special venting system
(AL-29-4C material). The zero inches
vent clearance to combustibles for the
Vitodens boiler supersedes the
clearance to combustibles listing that
appears on the special venting system
marking.
Flexmaster Canada Ltd.
452 Attwell Drive
Etobicoke, ON
M9W 5C3
Tel. [phone]
Z-FLEX (US) INC.
20 Commerce Park North
Bedford, NH
03110-691
Tel. [phone]
Heat-Fab, Inc.
130 Industrial Blvd.
Turners Falls, MA
01376
Tel. [phone]
ProTech Systems, Inc.
400 South Pearl Street
Albany, NY
12202
Tel. [phone]
Security Chimneys International Ltd.
2125 Rue Monterey
Laval, QC
H7L 3T6
Tel. [phone]
For exhaust vent pipe material:
Do not use any other vent material.
Do not use galvanized pipe, plastic pipe
and/or chimney liners (rigid or flexible)
of any kind.
5368 815 v2.0 b
IMPORTANT
The use of vent material other than
listed AL29-4C stainless steel,
positive pressure vent pipe and
fittings can cause property damage,
severe personal injury and/or loss of
life.
WARNING