Navien NPE-180A2 Installation Manual page 58

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.
Flexible PP
Model Vent
Centrotherm
Type Dia.
Innoflue
Flex*
NPE-
2 in. 50 ft
150S2,
180A2/S2,
3 in. 100 ft
210A2/S2
2 in. n/a
NPE-
240A2/S2
3 in. 100 ft
* List of approved materials can be found on page
52.
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 fl exible vent materials
●
must be in INDIRECT vent applications only.
Refer to the vent manufacturer's literature for
●
detailed information and guidelines.
Outdoor Installation
Outdoor installation should only be considered
in mild climates. Freezing temperatures or
contaminated air can damage the water heater.
When installing the water heater outdoors, maintain
clearances from building openings, as described
in the "Non-Direct Venting (Single Pipe)" section
on page 49. Outdoor installation areas should
be in an open, unroofed area and should allow for
the following minimum clearances from the water
heater:
58 Installing the Water Heater
Flexible
SS
Duravent Duravent
Polypro FasNSeal
Flex* Flex*
n/a 35 ft
100 ft n/a
n/a 35 ft
100 ft n/a
Top
Intake Air
Back
Side
Bottom
Back
Sides
Front
Top
When installing a water heater outdoors, follow
these guidelines:
The Navien Outdoor Vent Kit must be used to
●
ensure proper operation of the water heater.
Ensure that there is plenty of clearance around
●
the air intake and that it is adequately protected
to prevent any debris, liquids, or flammable gases
from entering the air intake.
If the water heater is installed under an eave,
●
maintain a clearance of 3 ft or more from the eave
to the top of the water heater vent terminals.
* Refer to Navien Outdoor Vent Kit installation
instructions for additional guidelines.
Exhaust Gas
Side
Front
Bottom
12 in.
0.5 in.
3 in.
24 in.
36 in.