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H. Polypropylene Venting
1. Running Flexible Polypropylene Vent (Liner)
Through Unused Chimney Chase
a.
It is the responsibility of the installing
contractor to procure polypropylene vent
system pipe and related components.
b. All listed polypropylene vent system
manufacturers must 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, the
pipe (liner) can be installed in a 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.
2. Pressure drop for flexible polypropylene line
is 20 % greater than from rigid pipe. Multiply
measured flexible polypropylene liner length
by 1.2 to obtain equivalent length.
3. Maximum equivalent vent length of flexible
polypropylene liner is 48 ft. (14.6 m).
32
Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
WARNING
WARNING
Asphyxiation 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 in accordance with their instructions.
When pipe is cut, the cut end must be square and
carefully deburred 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 multiple flues is being used for
appliance venting. The flexible vent installation is not
permitted through any of the 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 vertical when used
for combustion product venting. Failure to do so will
result in improper condensate drainage and possible
subsequent vent pipe blockage.
I. Optional Room Air for Combustion
1. General Guidelines
a. Room air is optional for commercial
applications. Follow the requirements in this
section when air for combustion is supplied
from the boiler room.
b. Avoid combustion air contaminants in the
boiler room. Permanently remove any
contaminants found in the boiler room. If
contaminants cannot be removed, do not
use room air for combustion.
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