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RECOMMENDED
SUPPORT
FOR
VENT TERMINATION
It is recommended
that sidewall
vent terminations
of over 24
inches
(0.6 M) in length
or rooftop
vent terminations
of over
36 inches
(1 M) in length
be supported
by
EITHER
the
factory
accessory
vent
termination
kit
or
field-supplied
brackets
or supports
attached
to the structure.
A factory
accessory
vent
termination
kit may be used for direct vent
terminations.
Termination
kits are available
for 2-in.
or 3-in.
pipe.
See Table 12 for available
options.
Table
12 - Vent
Termination
Kit for Direct
Vent
(2-pipe)
Systems
DIAMETER
OF
DIRECT VENT
TERMINATION
COMBUSTION
AIR
(2-PIPE)
SYSTEM
AND VENT PIPES -
TERMINATION
KIT
IN. (mm)
2-in. (51 mm)
Single Penetration
of
1, 1-1/2, 2, or 2-1/2
Concentric
Vent Kit
Wall or Roof
(24, 36, 51,64 mm)
3-in. (76 mm)
Single Penetration
of
2-1/2, 3 or 4
Concentric
Vent Kit
wall or Roof
(64, 76, 102 mm)
Direct
Vent
/ 2-Pipe System
In a direct-vent
(2-pipe)
system,
all air for combustion
is taken
directly
from
outdoor
atmosphere,
and
all
flue
products
are
discharged
to outdoor
atmosphere.
Combustion-air
and vent pipes
nmst
terminate
together
in the same
atmospheric
pressure
zone,
either through
the roof (preferred)
or a sidewall.
See Fig. 46 for
references
to clearances
required
by National
code authorities.
OPTIONAL
CONFIGURATION
FOR COMBUSTION
AIR INLET PIPE
In applications
where
there
is a risk
of excessive
moisture
entering
the combustion
air inlet pipe, a moisture
trap may be
added to the inlet pipe to help prevent
moisture
from entering
the furnace from the combustion
air inlet pipe.
See Fig. 52.
When
sizing
venting
systems,
the
equivalent
length
of the
optional
inlet pipe moisture
trap must be taken into account.
Ventilated
Combustion
Air
Systems
In a ventilated
combustion
air option,
the vent
terminates
and
discharges
the flue products
directly
to the outdoors
similar
to a
direct vent system.
See Fig. 47 for references
to clearances
required
by National
code authorities.
All air for combustion
is piped
directly
to the furnace
from a space
that is well ventilated
with outdoor
air (such
as an attic or crawl
space)
and the
space
is well
isolated
from
the
living
space
or
garage.
Combustion
air requirements
for this option are the same as
the requirements
for providing
outside
air for combustion
for a
single
pipe vent system.
Refer
to the "Air For Combustion
and
Ventilation"
Section.
Non-Direct
Vent
(1-pipe) System
In a non direct-vent
(1-pipe)
system,
all air for combustion
is taken
from
the
area
adjacent
to furnace,
and
all flue
products
are
discharged
to outdoor
atmosphere.
Air for combustion
nmst
be
supplied
as described
in the Air For Combustion
and Ventilation
Section.
Do not use an abandoned
chinmey
to supply outside
air to
the furnace.
See Fig. 47 for references
to vent clearances
required
by National
code authorities.
A combustion
air pipe
to the
outdoors
is not
required
for a
single-pipe
vent system. A 12-in. (304 ram) long pipe with a 2-in.
(51 ram) tight radius 90 degree elbow is required
to be attached
to
the combustion
air pipe adapter
on the furnace.
See Fig. 46.
This
short
inlet air pipe helps to ensure
stable
combustion,
as well as
allow
for sound
attenuation.
To aid sound
attenuation,
point
the
inlet
air pipe
away from
occupants.
An extra elbow
and/or
five
feet
of pipe
may be
used to accomplish
the
sound
attenuation
function.
OPTIONAL
VENTING
BELOW
THE
FURNACE
The venting
system
may be
positioned
below
the furnace
ONLY
IF the factory
accessory
External
Vent Trap Kit is used.
The External
Vent Trap Kit is only
approved
for PVC/ABS
DWV venting
systems.
CAREFULLY
FOLLOW
THE
INSTRUCTIONS
PROVIDED
WITH
THE EXTERNAL
VENT
TRAP KIT
FOR
LAYING
OUT
THE
VENTING
SYSTEM
AND
THE
DRAIN
SYSTEM.
The instructions
included
with this
furnace
DO NOT
APPLY
to vent
systems
that are located
below the furnace.
CARBON MONOXIDE
POISONING HAZARD
Failure to follow the instructions
outlined below
for each
appliance being placed into operation could result in carbon
monoxide poisoning or death.
The instructions included with this furnace DO NOT APPLY
to
vent
systems
that
are
located
below
the furnace.
CAREFULLY
FOLLOW
THE
INSTRUCTIONS
PROVIDED WITH THE EXTERNAL
VENT TRAP KIT
FOR LAYING OUT
THE
VENTING
SYSTEM
AND
THE
DRAIN SYSTEM
when all or part of the venting
system is placed below the furnace.
Proper configuration of the venting and drain system is critical
when placing all or part of the venting system below the level
of the furnace, VENT GASSES COULD BE RELEASED
FROM
THE
DRAINAGE
SYSTEM
if the instructions
provided with the External Vent Trap Kit are not followed.
Locating
the Vent Termination
General
Combustion-air
inlet
pipe
(direct
vent/2-pipe
system
only)
and
vent pipe must terminate outside
structure,
either through sidewall
or roof.
For vent termination
clearance,
references
to National
codes
are
shown
in Fig. 46 for Direct
Vent/2-Pipe
system
and Fig. 47 for
Ventilated
Combustion
Air/Non-direct
Vent/l-Pipe
system.
For
exterior
termination
arrangements,
refer
to Fig.
48
for Direct
Vent/2-Pipe
system
and
Fig.
49
for
Ventilated
Combustion
Air/Non-Direct/I-Pipe
system.
Contact
Local code authorities
for
other
requirements
to and/or exemptions
from the National
codes
shown
in the figures.
Roof
termination
is often
preferred
since
it is less susceptible
to
damage
or contamination,
is usually
located
away from
adjacent
structures,
is less prone to icing conditions,
and and it often has less
visible
vent vapors.
Sidewall
terminations
may require
sealing
or
shielding
of building
surfaces
with
a corrosive
resistance
material
due to the corrosive
properties
of combustion
products
from
the
vent system,
as well as protection
of adjacent
structures.
37
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