Navien NCB-240/110H User Manual

93Installing a Common Vent System
Note
●
The illustration is intended for
reference purposes only.
●
Direct the exhaust away from any
building openings.
●
During cold weather situations, the
temperature of the exhaust will be
much warmer than the ambient air.
Therefore, you will see water vapor
being produced at the termination.
9.7 Installing a Condensate Drain
Refer to the following examples to install a
condensate drain hose (field supplied) to the
common vent system. The condensate drain hose
prevents condensate or rain from entering the
exhaust system and gathering above the Common
Vent Collar Kit. The exhaust vent must be sloped
down towards the drain to prevent water from
collecting within the pipe.
Siphon loop
Drain hose
Exhaust
Drain
Siphon loop
Drain hose
Drain
Exhaust
In
take
End
Cap
En
d
Ca
p
Intake
9.6.3 Direct Vent Application –
Horizontal Installation
12" (300 mm) min.
12" (300 mm) min.
Exhaust Gas
Intake Air
In cases where a 12” horizontal clearance is not
possible, provide a vertical clearance of at least
36” with the exhaust above the intake but do not
exceed 20’.
Intake
Maximum
length 20’
(6 m)
Minimum
length 36”
(91 cm)
Exhaust

Navien NCB-240/110H Specifications

General

Brand	Navien
Model	NCB-240/110H
Category	Boiler
Language	English