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8
58MCB
DOWNFLOW SUBBASE — DIMENSIONS (In.)
*
The plenum should be constructed 1/4 in. smaller in width and depth than the plenum dimensions shown above.
FURNACE
CASING
WIDTH
FURNACE IN DOWNFLOW APPLICATION
PLENUM OPENING
*
FLOOR OPENING
HOLE NO.
FOR WIDTH
ADJUSTMENT
A
B
C
D
17-1/2
Furnace with or without Cased Coil
Assembly or KCAKC Coil Box
15-1/8
19
16-3/4
20-3/8
3
21
Furnace with or without Cased Coil
Assembly or KCAKC Coil Box
18-5/8
19
20-1/4
20-3/8
2
24-1/2
Furnace with or without Cased Coil
Assembly or KCAKC Coil Box
22-1/8
19
23-3/4
20-3/8
1
LOCATING
TAB
LOCATING
TAB
1
2
3
4
4
3
2
1
B
D
Assembled
Disassembled
A97427
A88207
;;;;
;;;;
C
A
1
1
/
4
″
TYP
PLENUM
OPENING
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
A96211
FIELD-
S
UPPLIED
2-IN. DIAMETER
PVC PIPE
FIELD-
S
UPPLIED
2-IN. DIAMETER
PVC 90 ELBOW
COMBU
S
TION-AIR DI
S
C
(FACTORY-
S
UPPLIED IN
LOO
S
E PART
S
BAG)
A
Combustion-Air Pipe for Non-Direct Vent (1-Pipe) Application (Sizes 040 through 120 Only)
LENGTH OF STRAIGHT
PIPE PORTION OF COMBUSTION
AIR INLET PIPE ASSEMBLY (IN.)
CASING WIDTH
A
17-1/2
8-1/2 ± 1/2
21
10-1/2 ± 1/2
24-1/2
12 ± 1/2
Summary of Contents for 58MCB040
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