Flashing And Storm Collar Installation; Vent Termination Location Requirements; Vertical Installations - Viessmann Vitocrossal 300 CU3A Installation Instructions Manual

CU3A Venting Systems Installation

Vent Termination Location Requirements

For sloped roof applications with distance b less than

18 in. (450 mm)
a minimum 18 in. (450 mm)
b <18 in. (450 mm)
For sloped roof applications with distance b greater

than 18 in. (450 mm)
For flat roof applications

a minimum 18 in. (450 mm)
b >18 in. (450 mm)
b
Single Pipe Venting (Room Air Dependent)

Vertical installations

The vent must be installed observing local regulations in
addition to National Codes, CAN/CSA-B149.1 or 2 (for
installations in Canada) or ANSI-Z223.1 or NFPA 54 (for
installations in the U.S.A.).
WARNING
Vent termination must be at least 12 in. (300 mm)
above the anticipated snow level (consult your local
building authorities or local weather office). Locate
vent termination in such a way that it cannot be
blocked by snow.
A vent used in a special venting system with positive
vent pressure and passing through a roof shall extend at
least 18 in. (450 mm) above the highest point where it
passes through the roof and any other obstruction within
a horizontal distance of 18 in. (450 mm).
The special vent system shall not be routed into, through,
or within any other vent such as an existing masonry or
factory-built chimney.
IMPORTANT
A masonry chimney flue may be used to route the venting
system only if no other appliance is vented in the same flue.

Flashing and storm collar installation

Flashings and storm collars are field supplied. Flashings
and storm collars suitable for Type B vent materials (or
better) may be used.
To obtain flashings and storm collars, please contact
your local vent material supplier. Follow the installation
instructions supplied by the special venting manufacturer.
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