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8
DOWNFLOW SUBBASE DIMENSIONS -- IN. (MM)
FURNACE
CASING
WIDTH
FURNACE IN DOWNFLOW APPLICATION
PLENUM OPENING FLOOR OPENING
HOLE NO.
FOR
WIDTH
AD JU ST ---
MENT
A B C D
17-1/2
(445)
Furnace with or without Cased Coil Assembly or
Coil Box
15---1/8
(384)
19
(483)
16-3/4
(425)
20---3/8
(518)
3
21
(533)
Furnace with or without Cased Coil Assembly or
Coil Box
18---5/8
(473)
19
(483)
20---1/4
(514)
20---3/8
(518)
2
24-1/2
(622)
Furnace with or without Cased Coil Assembly or
Coil Box
22-1/8
(562)
19 (483)
23-3/4
(603)
20---3/8
(518)
1
*The plenum should be constructed 1/4---in. (6 mm) smaller in width and depth than the plenum dimensions shown above.
C
A
1
1
/
4
″ (32 μμ) TYP
PLENUM
OPENING
FACTORY-SUPPLIED
FIELD-INSTALLED
INSULATION
LOCATING
TAB
4
3
2
1
1
2
3
4
B
D
LOCATING
TAB
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. (mm)
CASING WIDTH A
17-1/2 8-1/2 ± 1/2 (216 ± 13 mm)
21 (533 mm)
10-1/2 ± 1/2 (267 ± 13 mm)
24-1/2 (622 mm)
12 ± 1/2 (305 ± 13 mm)
A96211
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC PIPE
FIELD-SUPPLIED
2-IN. (51 mm) DIA.
PVC 90° ELBOW
COMBUSTION-AIR DISC
(FACTORY-SUPPLIED IN
LOOSE PARTS BAG)
A
(445 mm)
CONCENTRIC VENT FOR DIRECT VENT (2--PIPE) APPLICATION (ALL MODEL SIZES)
C IN. (MM) DIA
B IN. (MM) DIA PVC
VENT/EXHAUST
1
3
/
16 (30 mm)
B IN. (MM) DIA PVC
INTAKE/COMBUSTION AIR
D
E
F
A
1
1/2
(38 mm)
KITPARTNO. A* B C D{ E F
KGAVT0701CVT 33---3/8 (848) 2 (51) 3---1/2 (89) 16---5/8 (422) 6---1/4 (159) 5---3/4 (146)
KGAVT0801CVT 38---7/8 (987) 3 (76) 4---1/2 (114) 21---1/8 (537) 7---3/8 (187) 6---1/2 (165)
*Dimension A will change accordingly as Dimension D is lengthened or shortened.
{Dimension D may be lengthened to 60---in. (1524 mm) maximum. Dimension D may also be shortened by cutting the pipes provided in the kit to 12--- in. (305
mm) minimum.
353AAV