Navien NBH Series User Manual

63Installing a Common Vent System
9.3 Starting the Common Vent System
9.3.1 Backflow Damper Assembly
Follow the instructions below to assemble the backflow damper
on the NHB boiler unit:
1. Remove the screws from the exhaust vent adapter.
2. Detach the exhaust vent adapter.
3. Connect the backflow damper to the exhaust duct of the boiler
unit.
4. Tighten the four mounting screws to secure the backflow
damper in place. The screws (x 4) are supplied with the
backflow damper.

Navien NBH Series Specifications

General

Brand	Navien
Model	NBH Series
Category	Boiler
Language	English