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KGASB0201ALL is used. Manufacturer’s accessory floor base is
not required when this furnace is installed on manufacturer’s Coil
Assembly Part No. CD5 or CK5, or Coil Box Part No. KCAKC is
used.
1. Determine application being installed from Table 3.
2. Construct hole in floor per dimensions specified in Table 3
and Fig. 5.
3. Construct plenum to dimensions specified in Table 3.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 6.
If coil assembly CD5, CK5, or Coil Box KCAKC is used,
install as shown in Fig. 7.
INSTALLATION ON COMBUSTIBLE FLOOR
1. Cut and frame hole in floor per dimensions in Installation
Instructions packaged with downflow subbase.
Table 2—Free Area Of Combustion Air Opening
58TMA
FURNACE
HIGH-FIRE
INPUT
(BTUH)
AIR UNCONFINED
SPACE FROM
OUTDOOR AIR THROUGH
VERTICAL DUCTS
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
OUTDOOR AIR THROUGH
SINGLE DUCT
Free Area
of Opening
(Sq In.)
Free Area of
Opening and Duct
(Sq In.)
Round
Pipe
(In. Dia)
Free Area of
Opening and Duct
(Sq In.)
Round
Pipe
(In. Dia)
Free Area of
Opening and Duct
(Sq In.)
Round
Pipe
(In. Dia)
63,000
100
15.8
5
31.5
7
21.0
6
84,000
100
21.0
6
42.0
8
28.0
6
105,000
105
26.3
6
52.5
9
35.0
7
123,000
123
30.8
7
61.5
9
41.0
8
Table 3—Opening Dimensions (In.)
FURNACE
CASING
WIDTH
APPLICATION
PLENUM OPENING
FLOOR OPENING
A
B
C
D
14-3/16
Non-Combustible Flooring
12-11/16
19
13-3/8
19-5/8
Combustible Flooring Using KGASB Subbase
11-13/16
19
13-7/16
20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
12-5/16
19
13-5/16
20
17-1/2
Non-Combustible Flooring
16
19
16-5/8
19-5/8
Combustible Flooring Using KGASB Subbase
15-1/8
19
16-3/4
20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
15-1/2
19
16-1/2
20
21
Non-Combustible Flooring
19-1/2
19
20-1/8
19-5/8
Combustible Flooring Using KGASB Subbase
18-5/8
19
20-1/4
20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
19
19
20
20
24-1/2
Non-Combustible Flooring
23
19
23-5/8
19-5/8
Combustible Flooring Using KGASB Subbase
22-1/8
19
23-3/4
20-3/8
Combustible Flooring with CD5 or CK5 Coil Assembly or
KCAKC Coil Box
22-1/2
19
23-1/2
20
Fig. 5—Floor and Plenum Opening Dimensions
A96283
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
6