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A
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
Assembled
FURNACE
FURNACE IN DOWNFLOW
CASING WIDTH
Furnace with or without Cased Coil
14--- 3/16 (360)
Furnace with or without Cased Coil
17--- 1/2 (445)
Furnace with or without Cased Coil
21 (533)
Furnace with or without Cased Coil
24--- 1/2 (622)
*The plenum should be constructed 1/4 ---in. (6 mm) smaller in width and depth than the plenum dimensions shown above.
Concentric Vent Kit
A concentric vent kit allows vent and combustion- -air pipes to
terminate through a single exit in a roof or side wall. One pipe
runs inside the other allowing venting through the inner pipe and
combustion air to be drawn in through the outer pipe.
DOWNFLOW SUBBASE
1
1
/ 4-IN. TYP
PLENUM
OPENING
C
A97427
DIMENSIONS (IN. / MM)
APPLICATION
Assembly or Coil Box
Assembly or Coil Box
Assembly or Coil Box
Assembly or Coil Box
A93086
LOCATING
TAB
LOCATING
TAB
PLENUM OPENING*
A
B
11--- 3/16
13--- 7/16
19 (483)
(322)
(341)
15--- 1/8
16--- 3/4
19 (483)
(384)
(426)
18--- 5/8
20--- 1/4
19 (483)
(396)
(514)
22--- 1/8
23--- 3/4
19 (483)
(562)
(603)
Downflow Subbase
One base fits all furnace sizes. The base is designed to be installed
between the furnace and a combustible floor when no coil box is
used or when a coil box other than a Carrier cased coil is used. It is
CSA design certified for use with Carrier branded furnaces when
installed in downflow applications.
12
B
4
3
D
2
1
2
3
4
A88207
Disassembled
FLOOR OPENING
HOLE NO. FOR
WIDTH
C
D
ADJUSTMENT
20--- 5/8
(600)
20--- 5/8
(600)
20--- 5/8
(600)
20--- 5/8
(600)
1
4
3
2
1
A88202
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