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Figure 20. Alternate Horizontal Vent Installation
Use Wall Thimble at
Vent Points
Support
Ground Level
Termination Tee
exchanger. The cover for the opening shall be attached in
such a manner as to prevent leaks.
If outside air is used as return air to the furnace for
ventilation or to improve indoor air quality, the system must
be designed so that the return air is not less than 50° F
(10° C) during operation. If a combination of indoor and
outdoor air is used, the ducts and damper system must be
designed so that the return air supply to the furnace is equal
to the return air supply under normal, indoor return air
applications.
When a cooling system is installed which uses the furnace
blower to provide airflow over the indoor coil, the coil must
be installed downstream (on the outlet side) of the furnace
or in parallel with the furnace.
If a cooling system is installed in parallel with the furnace,
a damper must be installed to prevent chilled air from
entering the furnace and condensing on the heat exchanger.
If a manually operated damper is installed, it must be
designed so that operation of the furnace is prevented when
the damper is in the cooling position and operation of the
cooling system is prevented when the damper is in the
heating position.
Return Air
In applications where the supply ducts carry heated air to
areas outside the space in which the furnace is installed,
the return air must be delivered to the furnace by duct(s)
sealed to the furnace casing, running full size and without
interruption.
!
WARNING:
The solid base of the furnace must be in place
when the furnace is installed with side return
air ducts. Removal of all or part of the base
could cause products of combustion to be
circulated into the living space and create
potentially hazardous conditions, including
carbon monoxide poisoning that could result
in personal injury or death.
Wall Thimble
(Inner Half)
Inner Shield
4
1
/
2
" Dia.
Wall Thimble Outer Half
Outer Overlapping
Shield 6
1
/
2
" Dia.
3" Termination
Tee
Protective
Screen
Inside
Combustible
Wall
Inside
Combustible
Wall
3" Vent
Pipe
Outside
Combustible
Wall
Inner
Overlapping
Shield 6
3
/
8
" Dia.
Locking Band
12" Min
Figure 21. Typical Termination
9.
The vent pipe must extend 1-1/4 inches through the
outer thimble half for a combustible wall. Be sure to
check this carefully before cutting the vent pipe.
10. Attach a 3 inch coupling to the end of the pipe that
extends through the wall or thimble. This prevents
the vent pipe from being pushed inward.
11. Cut an 8 inch minimum piece of vent pipe and
connect the coupling to the termination tee. The
inside of the tee must be a minimum of 12 inches
from the outside of the wall. (See Figure 21.)
Flexible Vent Systems
Flexible gas vent is approved for use in vertical single vent
or common vent installations only. The minimum distance
to combustibles is 1" for type B insulated and 6" for single
wall. The venting system must be installed in accordance
with the local authorities, the vent manufacturer's instructions
and the instructions listed below.
The flexible vent must be installed in accordance with the
venting tables for vertical or common venting only. The
vent system must be supported in horizontal runs with
3/4" pipe strap at a maximum of 5 foot intervals. All
horizontal sections must have a slope toward the furnace
of not less than 1/4" per foot. The vent must not sag, or
have any bends greater than 90 degrees.
CIRCULATING AIR SUPPLY
General
Plenums and air ducts must be installed in accordance with
the Standard for the Installation of Air Conditioning and
Ventilating Systems (NFPA No. 90A) or the Standard for
the Installation of Warm Air Heating and Air Conditioning
Systems (NFPA No. 90B).
It is recommended that the outlet duct be provided with a
removable access panel. This opening should be accessible
when the furnace is installed in service and shall be of a
size that smoke or reflected light may be observed inside
the casing to indicate the presence of leaks in the heat
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