Navien NHB H Series Installation And Operation Manual page 66

Indoor Boiler Installation Venting
Examples (continued)
Low Profile Two-Pipe Sidewall Venting*
●
Exhaust
Intake Air
(from
(from outdoors)
appliance)
Exterior View
* IPEX and Centrotherm Low Profile terminations
only
** Clearance above highest anticipated snow level
or grade, or as required by local codes, whichever
is greater
Only the following orientations are
Note
allowed for twin pipe terminations.
NEVER install in this orientation with the
exhaust located nearest to the ground.
66 Venting for Combustion Air
Flexible Vent Systems (Polypropylene)
●
Only VERTICAL installations are
Note
●
allowed. Horizontal terminations are
prohibited.
The use of proper adapters and
●
supports are required to fully
complete the installation.
The following table lists the flexible vent models
that are approved for use with this appliance in
addition to the maximum allowable vent lengths for
the desired vent system.
Vent Dia.
Centrotherm Innoflue Flex
2 in
Only the flexible vent models listed above are
●
approved for use with this appliance.
All flexible vent pipe must be installed
●
VERTICALLY through the roof. No horizontal
terminations are permitted.
Use a 2 in snap fit coupler or the InnoFlue®
●
Single Wall Residential vent pipes to connect the
InnoFlue® Flex 2 in vent pipes to the exhaust.
After installation, ensure that the vent system is
●
tightly sealed at the joints.
All installations using the flexible vent materials
●
must be in INDIRECT VENTING only.
Refer to the vent manufacturer's literature for
●
detailed information and guidelines.
Flexible PP
50 ft