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VII. Venting (continued)
C. Polypropylene Venting
1. Running Flexible Polypropylene Vent
a. It is the responsiblity of the installing
(Liner) Through Unused Chimney Chase
contractor to procure prolypropylene vent
system pipe and related components.
b. All listed polypropylene vent system
manufacturers comply with the requirements
of ULC-S636-08 'Standard for Type BH Gas
Venting Systems'. For Canadian installation,
polypropylene vent must be listed as a
ULC-S636 approved system.
c. Flexible polypropylene pipe must be treated
carefully and stored at temperatures higher
than 41 degrees F.
d. When flexible polypropylene pipe (liner) is
used for combustion air supply to a boiler,
the pipe (liner) can be installed in vertical or
horizontal position.
e. Follow manufacturer instructions regarding
application/listing, permits, minimum
clearances to combustibles, and installation
details (proper joint assembly, pipe support
and routing, gasket and fitting installation,
optional tooling availability/usage, routing
through masonry chimney for combustion
product venting or, combination of combustion
product venting and combustion air supply).
f. When using a masonry chimney as a
passageway for flexible polypropylene pipe,
the chase must be structurally sound and free
of any debris or obstructions.
g. To prevent condensate pooling and damage to
vent, offsets (bend) cannot exceed 45˚. Multiple
offsets are allowed in a chase.
Assphysiation Hazard. Vent systems made by
listed PP vent system manufacturers rely on
gaskets for proper sealing. When this type
of vent system is used, take the following
precautions:
Make sure that gasket is in position and
undamaged in the female end of the pipe.
Make sure that both male and female pipes are
free of damage prior to assembly.
Only cut vent pipe as permitted by the vent
manufacturer
instructions. When pipe is cut, cut end must
be square and carefully de-burred prior to
assembly.
Use locking band clamps at all vent pipe joints.
Flexible polypropylene vent must be installed
only in an unused chimney. A chimney, either
single or multiple flue type, is considered
unused when one of the flues is being used
for any appliance venting, or When one of
the mulitple flues is being used for appliance
venting. The flexiable vent installation is not
permitted through any of adjacent flues.
Do not bend or attempt to install flexible pipe
if it has been stored at ambient temperature
below 41 F. This will cause material to became
brittle and will lead to cracks, resulting in flue
gas leaks.
Do not install flexible polypropylene pipe at
an angle greater than 45 degrees from vertial
plane when used for combustion product
venting. Failure to do so will result in improper
condensate drainage towards the boiler and
possible subsequent vent pipe blockage.
26
WARNING
in
accordance
with
their
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