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VII. Venting (continued)
K. 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. A l l l i s t e d p o l y p ro p y l e n e v e n t sy s t e m
m a n u fa c t u re rs m u st co m p l y w i t h t h e
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).
L. 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.
AMP 400-1000L I&O Manual
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 manu-
facturer 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 mul-
tiple 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.
2. Outdoor Openings to Boiler Room
a. Provide combustion and ventilation air to the
boiler room or enclosure. Follow the National
fuel Gas Code, ANSI Z223.1, or, in Canada,
Installation Code for Gas Burning Appliances and
Equipment, CSA Standard B149 Code as well as all
applicable local codes. Use one of the following
methods.
WARNING
WARNING
This appliance must not be installed in a room under
negative pressure. An equipment room under negative
pressure could deplete the combustion air supply to
the appliance and cause leakage of flue gas from the
venting system.
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