13
•
The vent termination of a
non-direct
vent
application must
terminate at least 4 feet below, 4 feet horizontally from, or 1
foot above any door, window, or gravity air inlet into any
building.
•
The vent termination of a
direct vent
application must
terminate at least 12 inches from any opening through which
flue gases may enter a building (door, window, or gravity air
inlet).
•
The vent termination of vent pipe run vertically through a
roof must terminate at least 12 inches above the roof line (or
the anticipated snow level) and be at least 12 inches from
any vertical wall (including any anticipated snow build up).
•
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.
NOTE:
In Canada, the Canadian Fuel Gas Code takes precedence over the preceding termination restrictions.
C
ANADIAN
V
ENTING
R
EQUIREMENTS
In Canada, venting must conform to the requirements of the current CAN/CSA-B149.1-05 Installation Code. Use only CSA-listed, ULC-
S636 compliant two- or three-inch 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.
S
TANDARD
F
URNACE
C
ONNECTIONS
It is the responsibility of the installer to ensure that the piping connections to the furnace are secure, airtight, and adequately
supported.
Vent/Flue Pipe
The vent pipe outlet is sized to accept 2” pipe. Secure vent/flue pipe directly into the
furnace fitting with the appropriate glue. Alternately, a small section of 2" pipe may be
glued in the furnace socket and a rubber coupling installed to allow removal for future
service. 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 creating an offset using two 45 degree elbows (Figure
8A). This joint can be rotated on the fitting to establish maximum clearance between
refrigerant lines, metering devices, and condensate drain lines, etc. This joint is the
equivalent of one 90 deg. elbow when considering elbow count.
NOTE:
For
non-direct vent
installations, a minimum of one 90° elbow should be in-
stalled on the combustion air intake coupling to guard against inadvertent blockage.
D
IRECT
V
ENT
I
NSTALLATIONS
On
upflow
units secure the combustion air intake pipe to the air intake coupling by using a take apart rubber coupling supplied
with the furnace or a plastic coupling. Also, the intake coupling may be inverted to allow the intake pipe to be glued directly
to it. After inverting the coupling, secure it to the furnace top with screws. 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. The combustion air intake
pipe can also be secured directly to the counterflow unit air intake pipe coupling.
Vent Termination Clearances
Figure 7
12"
Non-Direct Vent
Vent/Flue Termination
No Terminations
Above Walkway
12"
min.
4'
min.
Non-Direct Vent
Vent/Flue Termination
Direct Vent
Vent/Flue Termination
<10'
Forced Air
Inlet
Non-Direct Vent
&
Direct Vent
Vent/Flue Terminations
Grade or Highest
Anticipated
Snow Level
3' min.
12" min.
4' min.
12" min.
45 DEGREE
ELBOWS
Increased Clearance Configuration
Figure 8A
