Accessory downflow subbase
FURNACE
WIDTH
14-3/16
17-1/2
21
24-1/2
* The plenum should be constructed 1/4 in. smaller in width and depth than the plenum dimensions shown above.
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
DIMENSIONAL DATA (In.)
PLENUM OPENING
A
B
11-13/16
19
15-1/8
19
18-5/8
19
22-1/8
19
" TYP
1
1
⁄
4
PLENUM
OPENING
A
C
Assembled
FILTER ARRANGEMENT
AIRFLOW
FRAMED FLOOR HOLE
C
13-7/16
16-3/4
20-1/4
23-3/4
LOCATING
LOCATING
TAB
A88206
Filter Retainers
(Field Supplied)
HOLE NO. FOR
D
WIDTH ADJUSTMENT
20-3/8
20-3/8
20-3/8
20-3/8
TAB
B
3
D
2
1
Disassembled
4
3
2
1
4
1
2
3
4
A88207
A94307
5