Additional Requirements For Stainless Steel Vent Pipe Material; Vent Requirements - Stainless Steel; Exhaust Vent Termination Options; Exhaust Vent Pipe Connection To Boiler - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

CU3A Venting Systems Installation

Vent Requirements - Stainless Steel

Exhaust vent termination options

Supplier Boiler Model
Flexmaster CU3A 26, 35
CU3A 45, 57
Heat-Fab CU3A 26, 35
CU3A 45, 57
ProTech CU3A 26, 35
CU3A 45, 57
Security CU3A 26, 35
Chimneys CU3A 45, 57
Note: Minimum vent pipe diameter with stainless steel vent system is 3 in. (80 mm).

Additional requirements for stainless steel vent pipe material

Use a special stainless steel venting system (UL/ULC
listed for category IV) for horizontal or vertical venting of
the Vitocrossal 300 CU3A boilers.
Contact one of the suppliers (see listing below) to order.
Prior to installation, check that the correct single-pipe
vent parts were ordered and supplied.
See exhaust vent termination chart for special stainless
steel single-pipe vent starter adaptor, coaxial increasers
and bird screen models required for your installation.
In case of discrepancies, contact original parts supplier.

Exhaust vent pipe connection to boiler

The vent connection to the Vitocrossal 300 CU3A boiler
must be made with a starter stainless steel adaptors
(supplied by others). The starter adaptors are intended for
a slip fit and slide into the boiler flue gas port with
a gentle twisting motion.
Note: The Vitocrossal 300 CU3A boiler has passed the
zero inches vent clearance to combustibles testing
requirements dictated by the Harmonized Standard
ANSI Z21.13. CSA 4.9 and therefore is listed for
zero clearance to combustibles when vented with
a single pipe special venting system.
The zero inches vent clearance to combustibles for
the Vitocrossal 300 CU3A boiler supersedes the
clearance to combustibles listing that appears on
the special venting system label.

Vent system manufacturers

Flexmaster Canada Ltd.
www.novaflex.com
ProTech Systems, Inc.
www.protechinfo.com
Security Chimneys
International Ltd.
www.securitychimneys.com
Stainless Steel Slip
Joint Starter Adaptor
3 in.
4 in.
3 in.
4 in.
3 in.
4 in.
3 in.
4 in.
ICC - Industrial Chimney Co.
www.icc-rsf.com
Heat-Fab, Inc.
www.selkirkcorp.com
Z-FLEX US Inc.
NovaFlex Group
www.novaflex.com
Single Pipe Venting (Room Air Dependent)
2SVSVB03
2SVSVB04
9301VSMN
9401VSMN
300568
300569
CTX-V3
CTX-V4
Component Parts of the Venting System (stainless steel)
Note: Product may not appear exactly as shown.
Termination Elbow
with Screen 90° or 45°
Vertical Termination Coupling
with Screen
3 in. 2SVSVT03
4 in. 2SVSVT04
3 in. 9392
4 in. 9492
3 in. 300186
4 in. 300187
Contact supplier
Contact supplier
Termination Coupling
with Screen
Termination Tee
with Screen
Termination Hood
with Screen
47