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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions 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).
Boiler Model
Nominal
Pipe
Diameter
Pipe Joint
Locking Band
Clamp
Combustion Air Vent
Ipex Low
Prole
Termination
Adapter &
Wall Plate
Boiler
Adapter
Sidewall Termination:
UV Resistant 90° Elbow
w/Screen
Roof Termination:
(2) UV Resistant 90°
Elbows
w/Screen
Boiler
Adapter
Sidewall * or Roof
Termination: UV
Resistant Straight
Pipe w/Screen
Flex
Chimney
Lining Kit
APX425C (reduced dia. vent)
APX525C (reduced dia. vent)
3 in.
(80 mm)
2ZDLC3
2ZDCPVC4
with 2ZDR43
Elbow: 2ZDE387UV
Screen: 2ZDES3
Elbow: 2ZDE387UV
Screen: 2ZDES3
2ZD144 with 2ZDR43
Pipe: 2ZDP3(*) UV
Screen: 2ZDES3
2ZDFK325
or
2ZDFK335
N/A
APX425C (standard dia. vent)
APX525C (standard dia. vent)
APX625C (reduced dia. vent)
APX725C (reduced dia. vent)
APX825C (reduced dia. vent)
4 in.
(100 mm)
2ZDLC4 2ZDCPVC4
Elbow: 2ZDE487UV
Screen: 2ZDES4
Elbow: 2ZDE487UV
Screen: 2ZDES4
2ZD144;
APX625C, APX725C,
& APX825C:
2ZDCPVCCG6 with
2ZDR65 & 2ZDR54
Pipe: 2ZDP4(*)
Screen: 2ZDES4
2ZDFK425
or
2ZDFK435
N/A
APX625C standard dia. vent)
APX725C standard dia. vent)
APX825C standard dia. vent)
6 in.
(150 mm)
2ZDLC6 2ZDCPVC4
Elbow: 2ZDE687
Screen: 2ZDES6
Elbow: 2ZDE687
Screen: 2ZDES6
2ZDCPVCCG6
Pipe: 2ZDP6(*)
Screen: 2ZDES6
N/A N/A
* Note: When using room air for combustion, use UV resistant 90° elbow or tee for sidewall vent termination. UV resistant 90° elbow part numbers: 2ZDE387UV (3 in.), 2ZDE487UV (4 in.), 2ZDE687UV (6 in.).
UV resistant tee part numbers: 2ZDTT3 (3 in.), 2ZDTT4 (4 in.), 2ZDTT6 (6 in.).
See Z-Flex Z-Dens literature for other required component part numbers such as straight pipe, elbows, firestops and vent supports.
(*) - Pipe Length
Table 4-24: Listed Polypropylene Pipe, Fittings and Terminations - Z-Flex Z-Dens
4 Venting (continued)
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