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Direct Venting (Two-pipe System)
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 32. and 33., 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 tables 31., 32. and 33. 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 a parallel
adaptor (available through Viessmann,
see table 31.) and the starter stainless
steel adaptor (supplied by others, see
tables 32. and 33.). 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
34.).
The bird screen for the air intake
termination elbow must also be ordered
from Viessmann (see table 34.).
44
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 supercedes the
clearance to combustibles listing that
appears on the special venting system
marking.
Flexmaster Canada Ltd.
452 Attwell Drive
Etobicoke, ON
M9W 5C3
Tel. (416) 679-0045
Z-FLEX (US) INC.
20 Commerce Park North
Bedford, NH
03110-691
Tel. (800) 654-5600
Heat-Fab, Inc.
130 Industrial Blvd.
Turners Falls, MA
01376
Tel. (800) 772-0739
ProTech Systems, Inc.
400 South Pearl Street
Albany, NY
12202
Tel. (800) 766-3473
Security Chimneys International Ltd.
2125 Rue Monterey
Laval, QC
H7L 3T6
Tel. (800) 363-0821
IMPORTANT
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.
WARNING
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.
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