Navien NHB H Series Installation And Operation Manual page 64

Indoor Boiler Installation Venting
Examples
WARNING
Fire and Explosion Hazard
To prevent death, serious injury or property
damage:
ALWAYS make sure to follow the provided
●
clearance requirements.
Failure to do so may result in circulating exhaust
●
gas and cause dangerous operation of the
boiler.
The following are some possible indoor venting
options:
Two-Pipe Sidewall Venting
●
Interior View
64 Venting for Combustion Air
Intake Air
Exhaust Gas
Exhaust Gas
Exterior View
Exhaust Gas
Intake Air
12" (300 mm) min.
Two-Pipe Snorkel Sidewall Venting
* Clearance above highest anticipated snow level or
grade, or as required by local codes, whichever is
greater.
Intake Air