Bryant 395CAV - Manual (Page 6)

WARNING: Do not install furnace on its back. Safety
control operation will be adversely affected. Never con-
nect return-air ducts to back of furnace. Failure to follow
this warning could result in fire, personal injury, or death.
II. FILTER ARRANGEMENT
WARNING: Never operate unit without a filter or with
filter access door removed. Failure to follow this warning
can cause fire, personal injury, or death.
The air filter arrangement will vary due to application, furnace
orientation, and filter type. The filter may be installed in an
external Filter/Media cabinet (if provided) or the furnace blower
compartment. Factory supplied washable filters are shipped in the
blower compartment.
If a factory-supplied external Filter/Media cabinet is provided,
instructions for its application, assembly, and installation are
packaged with the cabinet. The Filter/Media cabinet can be used
with the factory-supplied washable filter or a factory-specified
high-efficiency disposable filter (see cabinet instructions).
If installing the filter in the furnace blower compartment, deter-
mine location for the filter and relocate filter retaining wire if
necessary. See Fig. 5 for side return application and Fig. 6 for
SUPPLY
AIR
6 ″ MIN
(FRONT) †
RETURN AIR
VENT THROUGH ROOF
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
12
″
MAX
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
12 ″ MAX
INTERIOR
HEATED
SPACE
* Minimum opening size is 100 sq in. with
minimum dimensions of 3 in.
† Minimum of 3 in. when type-B1 vent is used.
UNCONFINED
SPACE
CONFINED SPACE
A89012
Fig. 3—Confined Space: Air for Combustion and Ventilation
from an Unconfined Indoor Space
1 SQ IN.
PER
4000
BTUH*
DUCTS
TO
OUTDOORS
1 SQ IN.
PER 4000
BTUH*
SUPPLY
AIR
VENT
THROUGH
ROOF
D
B
A
C
E
1 SQ IN.
PER 4000
BTUH* DUCT
TO
OUTDOORS
RETURN AIR
1 SQ IN.
PER 2000
BTUH*
1 SQ IN.
PER 2000
BTUH*
DUCTS
TO
OUTDOORS
12
″
MAX
12
″
MAX
12
″
MAX
Use any of the following
combinations of openings:
A & B C & D D & E F & G NOTE:
* Minimum dimensions of 3 in.
CONFINED SPACE
12
″
MAX
12
″
MAX
OUTDOORS
1 SQ IN.
PER
4000
BTUH*
F
G
A89013
Fig. 4—Confined Space: Air for Combustion and Ventilation
from Outdoors
TABLE 2—MINIMUM FREE AREA OF COMBUSTION AIR OPENING*
395CAV
FURNACE
INPUT
(BTUH)
AIR FROM INDOOR
UNCONFINED SPACE
OUTDOOR AIR THROUGH
VERTICAL DUCTS
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
OUTDOOR AIR THROUGH
SINGLE DUCT
Free Area
of Opening
(Sq. In.)
Free Area of
Opening and Duct
(Sq. In.)
Round
Pipe
(In. Dia.)
Free Area
of Opening and Duct
(Sq. In.)
Round
Pipe
(In. Dia)
Free Area
of Opening and Duct
(Sq. In.)
Round
Pipe
(In. Dia)
44,000 100 11.0 4 22.0 6 14.67 5
66,000 100 16.5 5 33.0 7 22.00 6
88,000 100 22.0 6 44.0 8 29.33 7
110,000 110 27.5 6 55.0 9 36.67 7
132,000 132 33.0 7 66.0 10 44.00 8
154,000 154 38.5 8 77.0 10 51.33 9
* Free area shall be equal to or greater than the sum of the areas of all vent connectors in the confined space. Opening area must be increased if other gas appliances in
the space require combustion air.
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