10
DOWNFLOW SUBBASE
A97427
Assembled
A88207
Disassembled
LOCATING
TAB
LOCATING
TAB
1
2
3
4
4
3
2
1
B
D
C
A
1
1
/
4
″
TYP
PLENUM
OPENING
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
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 should 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.
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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 Payne cased coil is used. It is
CSA design certified for use with Payne branded furnaces when
installed in downflow applications.
