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DOWNFLOW SUBBASE
LOCATING
TAB
LOCATING
TAB
1
2
3
4
4
3
2
1
B
D
C
A
1
1
/
4-IN. TYP
PLENUM
OPENING
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
Assembled
Disassembled
A97427
A88207
DIMENSIONS ( IN. / MM)
FURNACE
CASING WIDTH
FURNACE IN DOWNFLOW
APPLICATION
PLENUM OPENING* FLOOR OPENING
HOLE NO. FOR
WIDTH
ADJUSTMENT
A B C D
17---1/2 (444.5)
Furnace with or without Cased Coil
Assembly or Coil Box
15---1/8
(384.2)
19 (482.6)
16---3/4
(425.5)
20---3/8
(517.5)
3
21 (533.4)
Furnace with or without Cased Coil
Assembly or Coil Box
18---5/8
(396.4)
19 (482.6)
20---1/4
(514.4)
20---3/8
(517.5)
2
24---1/2 (622.3)
Furnace with or without Cased Coil
Assembly or Coil Box
22---1/8
(562.0)
19 (482.6)
23---3/4
(603.3)
20---3/8
(517.5)
1
*The plenum shou ld be constructed 1/4---in. (6 mm) smaller in width and depth than the plenum dimensions shown above.
Concentric Vent Kit
A93086
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
A88202
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.
915SA