Selecting A Vent System - Navien NCB-24LSWE Installation & Operation Manual

5.2 Selecting a Vent System

WARNING
The gas removal ducts must not be in contact with or near
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flammable materials and they must not pass through any
structures or walls of buildings made of such materials.
If you replace the boiler, the old gas removal system must
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be replaced by a new one.
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:
Adapter
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 boiler (the gas
removal and air intake adapters).
3. Connect the gas removal and intake ducts.
Exhaustion and intake ducts
Air intake cap
Adapter
Venting the Boiler 31