Navien NHB H Series User Manual

77Installing a Common Vent System
WARNING
Improper venting of the boiler can result in
excessive levels of carbon monoxide and can
lead to serious injury or death.
This boiler must be vented in accordance with
the “Venting of Equipment” section of the latest
edition of the ANSI Z223.1/NFPA 54 Natural
Fuel Gas Code in the USA and/or the “Venting
systems and air supply for boilers” section of the
latest version of the CAN/CGA B149.1 Natural
Gas and Propane Installation Code in Canada,
as well as all applicable local building codes and
regulations.
To prevent serious injury or death:
●
ONLY licensed professionals should install
venting.
●
ALWAYS follow all regulations, codes, and
instructions when venting the boiler.
●
ALWAYS seal the venting system gastight
to prevent flue gas leakage and carbon
monoxide emissions.
●
The building owner is responsible to maintain
the exhaust and intake terminations free of
snow, ice, or other potential blockages, as
well as scheduling routine maintenance.
9.1 About the Common Vent
System
The Navien Common Vent System* provides an easy
way to install the vent system for up to 8 Navien
NHB-H boiler units. By sharing the main intake and
exhaust vent pipes, effective system venting is
available with less venting materials and minimal
number of penetrations on the walls or roofing.
* Independently tested and approved by CSA
Read all safety messages and carefully follow the
guidelines in this manual when installing a common
vent system for the NHB-H boiler units.
DANGER
This appliance is certified as a “Category IV”
appliance and requires a special venting system.
The vent system operates with a positive
pressure in the pipe.
To prevent serious injury or death:
●
ALWAYS vent exhaust gases directly outdoors
using the vent materials and following these
instructions.
●
DO NOT connect vent connectors serving
appliances vented by natural draft into
any portion of mechanical draft systems
operating under positive pressure.
9. Installing a Common Vent System

Navien NHB H Series Specifications

General

Brand	Navien
Model	NHB H Series
Category	Boiler
Language	English