Carrier 58TMA FreeArea Of Combustion Air Opening, Floorand Plenum Opening Dimensions

Table 2—Free Area Of Combustion Air Opening

58TMA	AIR UNCONFINED	OUTDOOR AIR THROUGH		OUTDOOR AIR THROUGH		OUTDOOR AIR THROUGH
FURNACE	SPACE FROM	VERTICAL DUCTS		HORIZONTAL DUCTS		SINGLE DUCT
HIGH-FIRE	Free Area	Free Area of	Round	Free Area of	Round	Free Area of	Round
INPUT	of Opening	Opening and Duct	Pipe	Opening and Duct	Pipe	Opening and Duct	Pipe
(BTUH)	(Sq In.)	(Sq In.)	(In. Dia)	(Sq In.)	(In. Dia)	(Sq In.)	(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

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.

	A
	PLENUM
	OPENING
B	D
	FLOOR
	OPENING
	C

					A96283
	Fig. 5—Floor and Plenum Opening Dimensions
	Table 3—Opening Dimensions (In.)
FURNACE		PLENUM OPENING		FLOOR OPENING
CASING	APPLICATION
		A	B	C	D
WIDTH
	Non-Combustible Flooring	12-11/16	19	13-3/8	19-5/8
14-3/16	Combustible Flooring Using KGASB Subbase	11-13/16	19	13-7/16	20-3/8
	Combustible Flooring with CD5 or CK5 Coil Assembly or	12-5/16	19	13-5/16	20
	KCAKC Coil Box
	Non-Combustible Flooring	16	19	16-5/8	19-5/8
17-1/2	Combustible Flooring Using KGASB Subbase	15-1/8	19	16-3/4	20-3/8
	Combustible Flooring with CD5 or CK5 Coil Assembly or	15-1/2	19	16-1/2	20
	KCAKC Coil Box
	Non-Combustible Flooring	19-1/2	19	20-1/8	19-5/8
21	Combustible Flooring Using KGASB Subbase	18-5/8	19	20-1/4	20-3/8
	Combustible Flooring with CD5 or CK5 Coil Assembly or	19	19	20	20
	KCAKC Coil Box
	Non-Combustible Flooring	23	19	23-5/8	19-5/8
24-1/2	Combustible Flooring Using KGASB Subbase	22-1/8	19	23-3/4	20-3/8
	Combustible Flooring with CD5 or CK5 Coil Assembly or	22-1/2	19	23-1/2	20
	KCAKC Coil Box

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