Navien NHB-110 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 NHB-110 Specifications

General

Category	Boiler
Brand	Navien
Model	NHB-110
Maximum Input	110, 000 BTU/h
Efficiency	95% AFUE
Weight	75 lbs
Vent Type	Direct Vent
Fuel Type	Natural Gas or Propane
Heat Exchanger Material	Stainless Steel
Water Connection Size	3/4 inch
Gas Connection Size	3/4 inch
Vent Material	PVC, CPVC, Polypropylene
Vent Size	2 inch