Navien NHB H Series Installation And Operation Manual page 91

9.6.3 Horizontal Intake and Exhaust
Termination
End
Cap
End
Cap
End Cap
9.6.4 Direct Vent Application –
Horizontal Installation
Exhaust Gas
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' .
Exhaust
Maximum
length
Intake
20' (6 m)
Minimum
length
36" (91 cm)
Exhaust
Note
Intake Air
Exhaust
Intake
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.
Installing a Common Vent System
Maximum
length 20'
(6 m)
Minimum
length 36"
(91 cm)
91