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4
Venting
(continued)
106308-05 - 3/23
APEX
Installation, Operating, & Service Instructions
a. Models APX425C and APX525C are listed
for vertical venting by installing flexible vent
in an UNUSED masonry chimney/chase
and supplying combustion air through
a separate wall or roof combustion air
terminal.
b. Refer to Figure 4-29 for details of chimney
chase installation.
c. Flexible polypropylene pipe must be treated
carefully and stored at temperatures higher
than 41°F (5°C).
d. Do not bend or attempt to install flexible
pipe if it has been stored at lower ambient
temperature without allowing the pipe to
warm up to a higher temperature first.
!
WARNING
Asphyxiation Hazard.
•
Bending or attempting to install flexible pipe if it
has been stored at ambient temperature below
41°F (5°C) will cause material to become brittle
and lead to cracks, resulting in flue gas leaks.
•
Do not install flexible polypropylene pipe at an
angle greater than 45 degrees from vertical
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.
e. When flexible polypropylene pipe (liner)
is used for combustion product venting, it
must not be installed at an angle greater
than 45 degrees from vertical plane. This
will ensure proper condensate flow back
towards the boiler.
f. 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.
g. Follow flexible polypropylene pipe
(liner) manufacturer specific installation
instructions regarding application/
listing, permits, minimum clearances to
combustibles, 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).
29
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