Navien NPE-240A Installation Manual page 32

2" or 3" Two-pipe Vertical Venting – Intake and exhaust pipes do
●
not have to terminate in the same area.
36" (900mm) min.
Intake Air
Concentric Roof Venting
●
Vent
Combustion Air
Vent
32 Installing the Water Heater
Exhaust Gas
12" (300mm) min.
From any
obstruction (above,
below, left, or right)
Maintain 12" (300mm) min.
(18" (450mm) min. for Canada)
Clearance above highest
anticipated snow level. Maximum
of 24" (600mm) above roof
Combustion Air
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 28. Outdoor installation
areas should be in an open, unroofed area and should allow for the
following minimum clearances from the water heater:
Top
Intake Air
Back
Side
Bottom 12"
Back 0.5"
Sides 3"
Front 24"
Top 36"
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 feet or more from the eave to the top of the water
heater vent terminals.
Exhaust Gas
Side
Front
Bottom