76 Installing a Common Vent System
9.3.2 Connecting the Pipe to the Damper
1. Measure 1-
1
/
2
” from the end of the vent pipe, then draw a mark
at that distance.
Mark 1-1/2” from
the end of the pipe
1-1/2”
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 screwdriver to properly seal the joint.
CAUTION
Do not start the vent run with a 90° 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 20’ of
equivalent length.
9.3.3 Assembling the T Joint
1. Use the proper reducers to connect the 2” branch pipe from
the unit to the common vent tee joint. Apply the proper
solvent cement to the mating surfaces.
Apply
Cement
PVC Reducer
Note
Multiple reducers can be used to allow proper
connection of 2" vent pipe to the common vent
system.
2. Assemble the tee joint assembly to the vent pipe. Apply
solvent cement to the mating surfaces.
Apply
Cement
Summary of Contents for NFC-175
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