88 Installing a Common Vent System
9.3 Starting the Common Vent
System
9.3.1 Common Vent Collar Kit Assembly
Follow the instructions below to assemble the
Common Vent Collar Kit on the NCB-H boiler unit:
1. Remove the screws from the exhaust vent
adapter.
2. Detach the exhaust vent adapter.
3. Connect the Common Vent Collar Kit to the
exhaust duct of the boiler unit.
Maintenance Port
Navien Common Vent Collar Kit has a maintenance
port to allow you to easily inspect the operating
condition of the damper plate.
Maintenance port
Damper plate
Maintenance port
Gasket
Maintenance port cover
Fix screw
Refer to “9.9 Maintenance” for detailed inspection
procedures.Navien Backflow Damper (Back-draft
Damper)
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