Navien NPE-32AWE Installation Manual page 30

3.6.2 Selecting a Flue System
WARNING
The gas removal ducts must not be in contact with
or near flammable materials and they must not pass
through any structures or walls of buildings made of
such materials.
If you replace the water heater, the old gas removal
system must be replaced by a new one.
The standard flue must be installed level. If flue
extensions are needed, they must have a 3 degree fall
back to the appliance.
The fume extraction connection depends on the type of system
chosen (coaxial removal system or dual duct removal system).
Carefully follow the instructions given below:
Coaxial System
For coaxial system, fit the components as shown in the figure:
30 Installing the Water Heater
Coaxial Flue
Dual Duct System
For dual duct system, fit the components as shown in the figure:
1. Remove the air intake cap.
2. Connect the corresponding adapters to the water heater
(the gas removal and air intake adapters).
3. Connect the gas removal and intake ducts.
Exhaustion and Intake ducts
Air intake cap
Adapter