Noritz NRC111-DV-NG Installation Manual page 14

3" or 4"
Intake*
*4" pipe requires the use of a reducing coupling just prior to
the termination.
3" PVC or CPVC
No. of
Max. Straight Vent Length**
Elbows
3
2
1
** Not including the concentric termination
14
Hanger
Straps
Strap
3" or 4"
Slope vent
Exhaust*
Upwards
PVC/CPVC
Coupling
4" PVC or CPVC
Max. Straight Vent Length**
10'
13'
16'
•
The concentric termination may be shortened,
but not lengthened from its original factory
supplied length.
•
3" or 4" PVC or CPVC pipe may be used with
the concentric termination. Maintain the same
1"
vent pipe diameter from the water heater flue to
Minimum
the termination.
• Do not exceed the maximum vent lengths as
specified in this section.
Insert Bird Screen
in End of Termination
• When using 4" pipe, it will be necessary to use
4" x 3" reducing couplings and a short section
of 3" pipe to connect to the termination.
Use no more than a 6" section pipe to make the
connection between the reducing couplings and
the termination.
• When using 3" pipe, it will be necessary to use
4" x 3" reducing couplings to connect the vent
pipe to the water heater flue.
•
There must be a minimum of 1" clearance between
the outside wall and the air intake section of the
termination as illustrated on the left.
•
Install a securing strap to prevent movement of
the termination.
•
Terminate at least 12" above grade or
above snow line.
•
Terminate at least 7' above a public walkway,
30'
6' from the combustion air intake of
any appliance, and 3' from any other
36'
building opening, gas utility meter, service
42'
regulator etc.
•
Terminate at least 3' above any forced air
inlet within 10', 1' below, 1' horizontally
from or 1' above any door, window, or
gravity air inlet into any building per National
Fuel Gas Code ANSI Z223.1/NFPA 54.
• Slope the horizontal vent 1/4" upwards
for every 12".
•
Use a condensation drain if necessary.
•
In the Commonwealth of Massachusetts
a carbon monoxide detector is required
for all side wall horizontally vented gas
fuel equipment. Please refer to Technical
Bulletin TB 010606 for full installation in
structions.