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WARNING
Periodically inspect all vent pipe connections.
The VID is not intended and should not be
relied upon to detect all instances of vent pipe
movement or separation from the collar.
Vent
Installation
Detector (VID)
Detectable*
* If inserted 2-3/4" (70 mm), then VID should detect vent
pipe.
Undetectable**
** VID can not detect if the vent pipe is leaking or
disconnected at any point between the boiler and
the exterior vent location or if the vent is blocked
for any reason.
5.3 Selecting a Vent Type
All Navien boilers are Category IV appliances and
prepared at the factory to be direct vented (sealed
combustion). Navien recommends direct air vent
installations whenever possible to avoid back
drafting cold air through the boiler unit. If you
cannot use a direct vent, ensure that an ample
supply of make-up air is available in the installation
location.
Navien also recommends installing a new vent
system with this appliance. If reusing an existing
vent system, thoroughly inspect it for punctures,
cracks, or blockages prior to connecting it to the
boiler.
Direct Venting
The boiler uses a 2 in or 3 in diameter exhaust and a
2 in or 3 in diameter air intake ducts. To ensure the
draw of air directly from and exhaust of air directly
to the outside of the building, create an airtight seal
from the boiler collar to the vent termination.
Intake materials can be made of ABS, PVC, CPVC, PP,
galvanized or stainless steel, corrugated aluminum
or any other such materials. If you use a corrugated
material, ensure that there is not inadvertent
crimping of, or damage to, the intake air pipe.
When using direct venting, maintain the following
venting clearances, as required by ANSI Z21.10.3
and the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, and CAN/CGA B149.1 Natural Gas and
Propane Installation Code:
57
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