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4
Venting
(continued)
ii.
Combustion Air Piping
• If possible, locate combustion
air termination on the same roof
location as the vent termination to
prevent nuisance boiler shutdowns.
Combustion air terminal may be
installed closer to roof than vent.
Alternatively, boiler may be installed
with vertical roof vent terminal and
sidewall combustion air terminal.
• Size roof opening to allow easy
insertion of combustion air piping
and allow proper installation of
flashing and storm collar to prevent
moisture from entering the structure.
-
Use appropriately designed
vent flashing when passing
through roofs. Follow flashing
manufacturers' instructions for
installation procedures.
-
Extend combustion air pipe to
maintain minimum vertical
and horizontal distance of 12 in.
(300 mm) from roof surface.
Allow additional vertical distance
for expected snow accumulation.
Provide brace as required.
-
Install storm collar on combustion
air pipe immediately above
flashing. Apply Dow Corning
Silastic 732 RTV Sealant or
equivalent between combustion
air pipe and storm collar to
provide weather-tight seal.
• Install screen and combustion air
terminal (supplied with boiler).
See Figure 4-20 for appropriate
configuration.
• Brace exterior piping if required.
C. Polypropylene Venting
NOTICE: Do not exceed maximum vent/
combustion air system length. Refer to "2. Vent/
Combustion Air Piping" under "A. General
Guidelines" of this section for maximum vent/
combustion air system length.
Use only vent and combustion air terminals and
terminal locations shown in "3. Vent/Combustion
Air Terminals" under "A. General Guidelines" of
this section.
26
APEX
Installation, Operating, & Service Instructions
!
WARNING
Asphyxiation Hazard.
Apply supplied dielectric grease to gasket
inside vent section of vent connector. Failure to
apply the grease could result in flue gas leaks
from gasket rupture during vent pipe installation
or gasket deterioration due to condensate
exposure.
1. Components
a. Listed polypropylene vent system
manufacturers are shown in Table 4-21 It is
the responsibility of the installing contractor
to procure polypropylene vent system pipe
and related components.
i.
All listed polypropylene vent system
manufacturers comply with the
requirements of ULC-S636-08 'Standard
for Type BH Gas Venting Systems'.
ii.
Centrotherm Eco Systems InnoFlue
SW Rigid Vent and Flex Flexible Vent,
and Z-Flex Z-Dens Single Wall Rigid
Vent and Flexible Vent comply with the
requirements of UL 1738 'Standard for
Safety for Venting Systems'.
b. See Table 4-22 for specific M&G Duravent
components.
c. See Table 4-23 for specific Centrotherm Eco
Systems components.
d. See Table 4-24 for specific Z-Flex Z-Dens
components.
2. Field Installation of Polypropylene
Adapters
a. Vent Connector (see Figure 4-25)
i.
No adapter is required for M&G
DuraVent PolyPro vent pipe unless vent
diameter is reduced per Table 4-2. See
Table 4-22 for M&G DuraVent boiler
adapters for reduced vent diameter.
An adapter is always required for
Centrotherm InnoFlue vent pipe and
Z-Flex Z-Dens vent pipe. See Table
4-23 for Centrotherm InnoFlue boiler
adapters and Table 4-24 for Z-Flex
Z-Dens boiler adapters.
ii.
Install CPVC/PP/SS vent connector.
Follow instructions in "2. Field
Installation of CPVC/PP/SS Vent
Connector" under "B. CPVC/PVC
Venting."
iii. Apply provided dielectric grease to
gasket inside vent connector that will be
in contact with adapter.
106308-05 - 3/23
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