63
WARNING!!!
Use of
cellular core PVC and CPVC
or Radel for venting system is
not allowed. Use of improper
materials can result in
excessive levels of carbon
monoxide which can result
in severe personal injury or
death!
WARNING!!!
Use only the
materials listed in Figure 11-7
and Figure 11-8 for vent pipe,
and fi ttings. Failure to comply
could result in severe personal
injury, death, or substantial
property damage.
NOTICE! Installation must comply
with local requirements and with the
National Fuel Gas Code, ANSI Z223.1
for U.S. installations or CSA B149.1
for Canadian installations.
For installation in Canada, vent pipe
system must be certifi ed to ULC-S636
(see Figure 11-7).
11.5 - Install vent
and combustion air
piping
WARNING!!!
This
heater must be vented and
supplied with combustion and
ventilation air as described
in this section. Ensure the
vent and air piping and the
combustion air supply comply
with these instructions
regarding vent system, air
system, and combustion air
quality. See also Section 11.2
of this manual. Inspect fi nished
vent and air piping thoroughly
to ensure all are airtight and
comply with the instructions
provided and with all
requirements of all applicable
codes. Failure to provide a
properly installed vent and
air system will cause severe
personal injury or death.
WARNING!!!
Using vent
materials other than those
listed in Figure 11-7 and Figure
11-8, failure to properly seal
all seams and joints, mixing
of venting materials or failure
to follow vent pipe and fi ttings
manufacturer’s instructions
can result in personal injury,
death or property damage.
11.4 - Minimum /
Maximum allowable
combustion air and
vent piping lengths
The maximum length of the two pipes
vent system is 120 equivalent ft (Air
intake plus fl ue exhaust). However,
each single pipe can’t be longer than
60 ft.
Each 45° elbow inserted in the
venting system, has a loss of pressure
equivalent to 3 ft of linear pipe.
Each 90° elbow inserted in the
venting system, has a loss of pressure
equivalent to 6 ft of linear pipe.
The minimum length of the venting
sytem is 1 ft (357 mm).
WARNING!!!
Increasing or
decreasing combustion air or
vent piping is not authorized.
Failure to comply could result
in severe personal injury,
death, or substantial property
damage.
11 - INSTALLATION - Vent and combustion air
Vent pipe materials and fi ttings must comply with the following standards
Item Material
Standard for installation
in USA
Standard for installation
in CANADA
Vent pipe and fi ttings
PVC schedule 40, 80 ANSI/ASTM D1785
ULC-S636
CPVC schedule 40/80 ANSI/ASTM F441
Polypropylene ULC-S636
Stainless steel AL29-4C UL1738
Pipe cement/primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
Figure 11-7 Approved vent materials
WARNING!!! Use of cellular core PVC, CPVC, and Radel for venting system is not allowed
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