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Vent Pipe Installation
CAUTION:
Combustion air must not be drawn from a
corrosive atmosphere.
This furnace has been certified for installation with zero
clearance between vent piping and combustible surfaces.
However, it is good practice to allow space for convenience
in installation and service.
• In the absence of local codes, the location of any
combustion air inlet relative to any vent terminal must
be at least 8 inches. This includes installations involving
more than one furnace.
• The quality of outdoor air must also be considered. Be
sure that the combustion air intake is not located near
a source of solvent fumes or other chemicals which
can cause corrosion of the furnace combustion system.
(See
page 5
for a sample list of substances).
• Route piping as direct as possible between the furnace
and the outdoors. Horizontal piping from inducer to
the flue pipe must be sloped 1/4" per foot to ensure
condensate flows towards the drain tee or PVC trap.
Longer vent runs require larger pipe diameters. Refer
to the Inducer & Venting Options section on
for additional information.
• If a Direct Vent (2-pipe) system is used, the combustion
air intake and the vent exhaust must be located in the
same atmospheric pressure zone. This means both
pipes must exit the building through the same portion of
exterior wall or roof as shown in
or
Figure 39 (page
49).
• Piping must be mechanically supported so that its weight
does not bear on the furnace. Pipe supports must be
installed a minimum of every five feet along the vent run
to ensure no displacement after installation. Supports
may be at shorter intervals if necessary to ensure that
there are no sagging sections that can trap condensate.
It is recommended to install couplings along the vent
pipe, on either side of the exterior wall
Figure
39). These couplings may be required by local
code.
• If breakable connections are required in the combustion
air inlet pipe (if present) and exhaust vent piping, then
straight neoprene couplings for 2" or 3" piping with
hose clamps can be used. These couplings can be
ordered through your local furnace distributor. To install
a coupling:
1. Slide the rubber coupling over the end of the pipe that
is attached to the furnace and secure it with one of the
hose clamps.
2. Slide the other end of the rubber coupling onto the other
pipe from the vent.
3. Secure the coupling with the second hose clamp,
ensuring that the connection is tight and leak free.
12
Outdoor Terminations - Horizontal Venting
• Vent and combustion air intake terminations shall
• Vent termination clearances must be consistent with the
• Vent and combustion air intake terminations must
• All minimum clearances must be maintained to protect
page 18
Figure 34 (page 44)
(Figure 34
or
be installed as shown in
accordance with these instructions:
NFGC, ANSI 2223.1/NFPA 54 and/or the CSA B149.1,
Natural Gas and Propane Installation Code. Table 16
(page 43) lists the necessary distances from the vent
termination to windows and building air intakes.
be located to ensure proper furnace operation and
conformance to applicable codes. A vent terminal
must be located at least 3 feet above any forced air
inlet located within 10 feet. This does not apply to the
combustion air inlet of a direct vent (two pipe) appliance.
In Canada, CSA B149.1 takes precedence over these
instructions. See
Table 16 (page
building materials from degradation by flue gases. ee
(Figure
8).
Figure 7. Inlet & Exhaust Pipe Clearances
Mechanical draft
vent terminal
NOTES:
1. All dimensions shown are
minimum requirements.
2. Exterior vent terminations must
be located at least 12" above the
maximum expected snow level.
Figure 8. Vent Locations
Figure 7
&
Figure 8
and in
43).
Direct vent
terminal - more
than 50,000 Btuh
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