12
7.
Vent Pipe Installation
• The first vertical run from the top of the heat
-
er should be no longer than 3'.
• Make sure vent pipe is gas tight and will not
leak. Use silicon sealant wherever necessary.
• Do not common vent or connect more than
one appliance to this venting system.
• The total vent length including horizontal &
vertical vent runs should be no less than 3'.
• Do not store hazardous or flammable sub-
stances near the vent termination and check
that the termination is not blocked in any way.
• Steam or condensed water may come out
from the vent termination. Select the location
for the termination so as to prevent injury or
property damage.
• If snow is expected to accumulate, take care
the end of the pipe is not covered with snow
or hit by falling lumps of snow.
• Consult the vent pipe manufacturer's install-
ation instructions for chimney connections.
Appliance Adapters
When using a vent system other than N-Vent,
an appliance adapter will be required to prop-
erly connect the vent to this appliance. Consult
the manufacturer's instructions for the proper
appliance adapter.
Vent Piping
• Noritz N-Vent is suggested for the vent system.
If N-Vent is not used, a UL listed category III
vent system must be used.
• Follow the vent pipe manufacturer's installation
instructions.
Pipe diameter
4"
No. of Elbows Max. Straight Vent Length*
3
15'
2
27'
1
39'
Clearances
Manufacturer and
Enclosed Unenclosed
Product
Hor. Vert. Hor. Vert.
Noritz N-Vent
4"
1"
1"
Clearances vary by manufacturer, refer to the UL
approved clearances when using materials other
than N-Vent.
(-SV type only, Indoor Installation)
10" (sides)
15"(top)
6"(bottom)
WARNING
Be sure to do
CARBON MONOXIDE POISONING
Follow all vent system requirements in accordance with relevant local or state regulation,
or, in the absence of local or state code, in the U.S. to the National Fuel Gas Code ANSI
Z233.1/NFPA 54 – latest edition, and in Canada, in accordance with NSCNGPI.
• Make the vertical section of the exhaust vent
as short as possible.
• Maintain the same vent pipe diameter from the
heater flue to the vent termination.
NR71-SV
Pipe diameter
3"
No. of Elbows Max. Straight Vent Length*
3
15'
2
25'
1
35'
NR66-SV
*Not including the termination.
