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96 Installing a Common Vent System
9.3.3 Assembling the Wye Joint
1. Assemble the hub wye, the 2” reducer, and the
90º elbow into the common vent. You can also
use the hub reducing wye and the 90º elbow to
assemble the common vent. Apply the proper
solvent cement to the mating surfaces.
Note
Tees can also be used instead of wye
fittings as part of the common vent.
Apply Cement
Apply Cement
[Hub Wye, 2” Reducer, 90˚ Elbow]
Apply Cement
[Hub Reducing Wye and 90˚ Elbow]
Note
Multiple reducers can be used to allow
proper connection of 2" vent pipe to
the common vent system.
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.
Note
Verify that 1-
1
/
2
” of the pipe has been
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.
CAUTION
Do not start the vent run with a street elbow at
the vent collar. Using a street elbow directly at
the collar will not allow for a tight seal between
the appliance and vent pipe. A length of straight
pipe must be used when starting the vent run.
Note
The length of vent pipe from the unit
to the common vent main trunk pipe
must not exceed 16’ of equivalent
length.
Summary of Contents for NFC-250/175H
Page 67: ...67 Venting for Combustion Air WARNING The vent installation detector Detectable Undetectable...
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