Navien NHB H Series Installation And Operation Manual page 85

Do not use primer or cement on the
Note
appliance connection.
1. Measure 1- / " from the end of the vent pipe,
1
2
then draw a mark at that distance.
Mark 1-1/2" from
the end of the pipe
2. Insert the vent pipe into the vent collar to start
the vent run. Make sure to completely slide the
vent into the collar until the end makes contact
with the bottom of the socket.
Verify that 1-
Note
completely inserted into the collar and
that the mark is no longer visible.
3. Tighten the clamp with a socket wrench (8 mm)
to properly seal the joint.
1-1/2"
/ " of the pipe has been
1
2
WARNING
NEVER start the vent run with a street elbow
at the vent collar to prevent serious injury or
death. Using an elbow directly at the collar will
not allow for a tight seal between the appliance
and the vent pipe.
ALWAYS use a length of straight pipe when
starting the vent run.
Do NOT use
street elbows
The length of vent pipe from the unit
Note
to the common vent main trunk pipe
must not exceed 16' of equivalent
length.
Installing a Common Vent System 85