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The vent termination of vent pipe run vertically through a roof
must terminate at least 12" (30.5 cm) above the roof line (or
the anticipated snow level) and be at least 12" (30.5 cm) from
any vertical wall (including any anticipated snow buildup).
A vent termination shall not terminate over public walkways
or over an area where condensate or vapor could create a
nuisance or hazard or could be detrimental to the operation
of regulators, relief valves or other equipment.
The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
Vent Termination Clearances
A
B
Vent Term Clear G 2009 ENV1
J
E
I
H
E
G
E
F
A. Nondirect vent and direct vent
vent/flue terminations
B. Nondirect vent—vent/flue
terminations
C. No terminations above walkway
D. 48" (121.9 cm) minimum
E. 12" (30.5 cm) minimum
NOTE: In Canada, the Canadian Fuel Gas Code takes
precedence over the preceding termination restrictions.
Canadian Venting Requirements
In Canada, venting must conform to the requirements of the
current CAN/CSA-B149.1-05 Installation Code. Use only CSA
approved, ULC-S636 compliant 2" or 3" (5.1 cm or 7.6 cm)
diameter PVC or ABS pipe, solvent cement and fittings
throughout. The certified piping should be clearly marked with
the ULC Std "S636" on the pipe and fittings.
Carefully follow the pipe manufacturers' instructions for cutting,
cleaning and solvent cementing PVC and/or ABS.
The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chimney is
insulated and closed with a weather-tight, corrosion-resistant
flashing.
Standard Furnace Connections
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight and adequately
supported.
As shipped, attachment "couplings" for vent/flue and combustion
air intake pipe connections are provided on the furnace's top
cover (upflow) or base pan (counterflow).
To use the standard connections, field-supplied vent/flue pipe
and combustion air intake pipe (when applicable) should be
secured directly to the furnace at these locations.
D
D
C
E
B
F. Direct vent—vent/flue
termination
G. Forced air inlet
H. Grade or highest anticipated
snow level
I. 3" (7.6 cm) minimum
J. Less than 10 ft (3 m)
Vent/Flue Pipe
Vent/flue pipe can be secured to the vent/flue coupling using the
rubber coupling and worm gear hose clamps provided with this
furnace. See "Standard Connections" illustration. The rubber
coupling allows separation of the vent/flue pipe from the furnace
during servicing. Combustion air and vent piping should be
routed in a manner to avoid contact with refrigerant lines,
metering devices, condensate drain lines, etc. If necessary,
clearances may be increased by utilizing two 45º long-sweep
elbows and creating an "S" joint to provide additional space at
connection locations. This joint can be rotated on the fitting to
establish maximum clearance between refrigerant lines, metering
devices, condensate drain lines, etc. This joint is the equivalent of
one 90º elbow when considering elbow count.
Increased Clearance Configuration
Clear Config G 2009
A. Vent pipe
B. 45º long-sweep elbows
NOTES:
Do not use other commercially available "no hub connectors"
due to possible material conflicts.
The vent/flue pipe can also be secured using a PVC or ABS
elbow or coupling using the appropriate glue (see "Materials
and Joining Methods").
For nondirect vent installations, a minimum of one 90° elbow
should be installed on the combustion air intake coupling to
guard against inadvertent blockage.
Combustion Air Pipe—Direct Vent Installations
On upflow units, secure the combustion air intake pipe directly to
the air intake coupling. On counterflow units secure the
combustion air intake pipe to the air intake coupling using the
rubber coupling and worm gear hose clamps provided with the
unit. The counterflow rubber coupling allows service removal of
air intake piping internal to the furnace blower compartment.
NOTE: Because of probable material conflicts, do not use other
commercially available "no hub connectors." The combustion air
intake pipe can also be secured directly to the counterflow unit
air intake pipe coupling.
A
B
15
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