Navien NFC-175 Installation & Operation Manual page 58

Indoor Boiler Installation Venting Examples
The following are some possible indoor venting options:
Two-Pipe Sidewall Venting
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Interior View
Exterior View
58 Venting the Boiler
Intake Air
Exhaust Gas
i n .
m ) m
0 0 m
1 2 " ( 3
Exhaust Gas
Intake Air
Non-Concentric Sidewall Venting - Air is drawn from a different
●
location that is at least 12 in (300 mm) away from the exhaust
termination. The exhaust termination can be located either on
the sidewall or roof. Try to minimize the length of the intake air
pipe when installing the vent.
* 12" (300mm) above the highest anticipated snow level, or as
required by local codes, whichever is greater
Concentric Sidewall Venting
●
Combustion Air
Vent
Concentric Vertical Venting
●
Vent
Combustion Air
Combustion Air
Maintain 12"
(300 mm)
Vent
min. clearance
above highest
1" (25 mm) min.
anticipated snow
level or grade,
whichever is
greater
Maintain 12" (300mm) min.
clearance above highest
anticipated snow level or
grade, whichever is greater
(maximum of 24" above roof)