Carrier 58MCB060 - Downflow Subbase Dimensions; Subbase and Plenum Opening Sizes

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
ADJUSTMENTABCD
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-SUPPLIED
2-IN. DIAMETER
PVC PIPE
FIELD-SUPPLIED
2-IN. DIAMETER
PVC 90 ELBOW
COMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS 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