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Alternate Combustion Air Intake Location—Counterflow
A
F
E
A. Section of pipe to be cut
B. Screw locations (4)
C. 2" (5.1 cm) minimum
8. With the gasket facing the cabinet side panel, and the
flange's flat spot facing forward, secure the combustion air
intake coupling to the cabinet using the screws removed in
Step 1 or with field-supplied ³⁄₈" #8 self-drilling screws.
WARNING
The rubber elbow is not designed to support a load.
Goodman 57
When the rubber elbow is mounted externally to the
furnace cabinet, extreme care must be taken to adequately
support field-supplied vent/flue piping, as damage can
result in leaks causing bodily injury or death due to
exposure to flue gases, including carbon monoxide.
9. For nondirect vent installations installed horizontally, a
minimum of one 90° elbow should be installed on the
combustion air intake coupling to guard against inadvertent
blockage.
NOTE: No elbow is required on the alternate combustion air
intake of upright installations, however, a minimum clearance
of 2" (5.1 cm) is required to assure proper air supply.
10. For direct vent installations, secure field-supplied combustion
air intake pipe directly to the air intake coupling.
NOTE: A PVC coupling or elbow is required on counterflow
furnaces.
Nondirect Vent (Single Pipe) Piping
Nondirect vent installations require only a vent/flue pipe. The vent
pipe can be run horizontally with an exit through the side of the
building or run vertically with an exit through the roof of the
building. The vent can also be run through an existing unused
chimney; however, it must extend a minimum of 12" (30.5 cm)
above the top of the chimney. The space between the vent pipe
and the chimney must be closed with a weather-tight, corrosion-
resistant flashing. See "Vent Pipe Installation—Standard Furnace
Connections" or "Vent Pipe Installation—Alternate Furnace
Connections."
Although nondirect vent installations do not require a combustion
air intake pipe, a minimum of one 90° elbow should be attached
to the furnace's combustion air intake if an upright installation
uses the standard intake location, or a horizontal installation uses
the alternate air intake location. This elbow will guard against
inadvertent blockage of the air intake.
20
B
C
D
D. Plastic plug—alternate combustion air
intake location
E. Screw locations (3)
F. Plastic plug from drain kit bag
Vent/Flue Pipe Terminations
The vent/flue pipe may terminate vertically, as through a roof,
or horizontally, as through an outside wall.
The penetration of the vent through the roof must be sealed
tight with proper flashing such as is used with a plastic
plumbing vent.
A 2³⁄₈" (6.1 cm) diameter wall penetration is required for 2"
(5.1 cm) diameter pipe.
A 3" (7.6 cm) diameter hole is required for a 2¹⁄₂" (6.4 cm)
pipe.
A 3¹⁄₂" (8.9 cm) diameter hole is required for 3" (7.6 cm)
diameter pipe.
To secure the pipe passing through the wall and avoid
damage to the piping connections, a coupling should be
installed on either side of the wall and solvent cemented to a
length of pipe connecting the 2 couplings.
The length of pipe should be the wall thickness plus the
depth of the socket fittings to be installed on the inside and
outside of the wall.
The wall penetration should be sealed with silicone caulking
material.
In a basement installation, the vent/flue pipe can be run
between joist spaces.
NOTE: If the vent pipe must go below a joist and then up into
the last joist space to penetrate the header, two 45° elbows
should be used to reach the header rather than two 90°
elbows.
Vertical Vent Termination (Single Pipe)
A. Tee
B. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
Alternate Vertical Vent Termination (Single Pipe)
B
A. 90º medium radius elbows
B. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
A
B
A
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