![Noritz proTOUGH NR981-DVC Installation Manual Download Page 10](http://html1.mh-extra.com/html/noritz/protough-nr981-dvc/protough-nr981-dvc_installation-manual_1705247010.webp)
10
> 3" (75mm)
(20-75mm)
0.8"-3"
< 0.8"
(20mm)
Straight Termination Installation Precautions.
Note the following vent terminal installation requirements.
• Do not install the vent terminal indoors
• Install the vent terminal with a downward slope
upward
slope
downward
slope
•
Install with the proper length protruding through the wall
• Avoid storing hazardous
objects near the terminal
Gasoline
Gas
Proper installation.
The red line can be
seen, but not more
than 2.2" (55mm)
from the wall.
Vent terminal
Vent terminal
not far
enough
too far
Snow
drift
Tree
• Avoid installing the terminal where obstacles
will block it
•
Do not cover the vent terminal with any type of protective
screen or enclosure. Blocked terminals can cause abnor-
mal combustion resulting in undesired performance from
the water heater.
8.
Vent Pipe Installation
• This appliance requires the use of special concentric type vent pipe speci
fi
ed by Noritz America.
Do not attempt to use materials that are not speci
fi
ed for use on this appliance.
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.
• Clearance from vent terminal.
If multiple units are installed, the concentric vent terminals must be separated
by a minimum of either 12" (300mm) horizontally or 60" (1.5m) vertically.
Vent terminal
Vent terminal
12" (300mm) or more
60" (1.5m) or more