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4
Venting
(continued)
iv. Push and twist adapter into vent system
connector until adapter bottoms out.
v.
Tighten clamp to secure adapter in
CPVC/PP/SS vent connector.
b. Combustion Air Connector (see Figure
4-26)
i.
No adapter is required if using PVC
combustion air pipe. An adapter
is required for both M&G DuraVent
PolyPro (see Table 4-22) Centrotherm
InnoFlue (see Table 4-23) and Z-Flex
Z-Dens (see Table 4-26) combustion air
pipes.
ii.
Insert adapter into combustion air
connector. Adapter has gasket to seal
against combustion air connector.
3. System Assembly
!
WARNING
Asphyxiation Hazard.
•
Vent systems made by listed PP vent system
manufacturers rely on gaskets for proper
sealing. When these vent systems are used, take
the following precautions:
•
Make sure that gasket is in position and un-
damaged in the female end of the pipe.
•
Make sure that both the 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, cut end
must be square and carefully de-burred prior
to assembly.
•
Use locking band clamps at all vent pipe
joints.
a. Plan venting system to avoid possible
contact with plumbing or electrical wires.
Start at vent connector at boiler and work
towards vent termination.
b. Follow all manufacturer instructions and
warnings when preparing pipe ends for
joining and when assembling the vent/
combustion air system.
c. Use locking band clamps at all vent pipe
joints. See Figure 4-27 or Figure 4-28 for
locking band clamp installation.
NOTICE: The venting system must be free
to expand and contract and supported in
accordance with installation instructions included
by the original listed polypropylene venting
component manufacturers, whichever applicable.
Polypropylene pipe sections must be disengaged
106308-05 - 3/23
APEX
Installation, Operating, & Service Instructions
1/4 to 5/8 in. (6 mm to 16 mm) per joint to allow for
thermal expansion.
4. Terminations
a. For standard horizontal sidewall
terminations, see Figures 4-6 and 4-7. For
vertical roof terminations, see Figures 4-9
and 4-10. Use UV resistant components
listed in Tables 4-22, 4-23 and 4-24.
b. If using M&G duravent PolyPro pipe, install
screens per Figure 4-20. Remove gasket
inside termination and install screen in
place of gasket. If using Centrotherm
InnoFlue or Z-Flex Z-Dens end pipe, screen
fits onto end of pipe.
c. For low profile sidewall termination, see
Figure 4-8. Use low profile termination listed
in Table 4-13 and adapter kit listed in Tables
4-22, 4-23 and 4-24.
5. Running Flexible Polypropylene Vent (Liner)
Through Unused Chimney Chase
!
WARNING
Asphyxiation Hazard.
Flexible polypropylene vent must be installed
only in an UNUSED chimney. A chimney, either
single or multiple flue type, is considered UN-
USED when none of the flues is being used for
any appliance venting. Where one of the multiple
flues is being used for an appliance venting, the
flexible vent installation is not permitted through
any of adjacent flues.
Table 4-21: Listed Polypropylene Vent System
Manufacturers
Make
PolyPro Single Wall Rigid Vent
M&G/DuraVent
PolyPro Flex Flexible Vent (APX425C and
APX525C)
InnoFlue SW Rigid Vent
Centrotherm Eco
Systems
Flex Flexible Vent (APX425C and APX525C)
Z-Dens Single Wall Rigid Vent
Z-Flex Z-Dens
Z-Dens Flexible Vent (APX425C and
APX525C)
NOTICE: Pressure drop for flexible polypropylene
liner is 20% greater than from rigid pipe. Multiply
measured flexible polypropylene liner length by
1.2 to obtain equivalent length.
Maximum equivalent length of flexible
polypropylene liner is 48 ft. (14.6 m).
Model
27
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