11
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
A96285
Fig. 12 − Furnace, Plenum, and Subbase Installed
on a Combustible Floor
APPROVED
COIL ASSEMBLY
OR
COIL BOX
FURNACE
SHEET METAL
PLENUM
FLOOR
OPENING
COMBUSTIBLE
FLOORING
A08556
Fig. 13 − Furnace, Plenum, and Coil Assembly or
Coil Box Installed on a Combustible Floor
Table 4 – Opening Dimensions − In. (mm)
FURNACE
CASING
WIDTH
APPLICATION
PLENUM OPENING FLOOR OPENING
A B C D
17–1/2
(445)
Upflow Applications on Combustible or Noncombustible Floor
ing (KGASB subbase not required)
16
(406)
21-5/8
(549)
16-5/8
(422)
22-1/4
(565)
Downflow Applications on Noncombustible Flooring (KGASB
subbase not required)
15-7/8
(403)
19
(483)
16-1/2
(419)
19-5/8
(498)
Downflow applications on combustible flooring (KGASB sub
base required)
15-1/8
(384)
19
(483)
16-3/4
(425)
20-5/8
(600)
Downflow Applications on Combustible Flooring with CNPV,
CNRV, CAR, or CAP Coil Assembly or KCAKC coil box
(KGASB subbase not required)
15-1/2
(394)
19
(483)
16-1/2
(419)
20
(508)
21
(533)
Upflow Applications on Combustible or Noncombustible Floor
ing (KGASB subbase not required)
19-1/2
(495)
21-5/8
(549)
20-1/8
(511)
22-1/4
(565)
Downflow Applications on Noncombustible Flooring (KGASB
subbase not required)
19-3/8
(492)
19
(483)
20
(508)
19-5/8
(498)
Downflow applications on combustible flooring (KGASB sub
base required)
18-5/8
(473)
19
(483)
20-1/4
(514)
20-5/8
(600)
Downflow Applications on Combustible Flooring with CNPV,
CNRV, CAR, or CAP Coil Assembly or KCAKC coil box
(KGASB subbase not required)
19
(483)
19
(483)
20
(508)
20
(508)
HORIZONTAL INSTALLATION
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return−air ducts to the back of the furnace.
!
WARNING
The furnace can be installed horizontally in an attic or crawl space
on either the left−hand (LH) or right−hand (RH) side. The furnace
can be hung from floor joists, rafters or trusses or installed on a
non−combustible platform, blocks, bricks or pad.
Suspended Furnace Support
The furnace may be supported under each end with threaded rod,
angle iron or metal plumber’s strap as shown. (See Fig. 15 and
16) Secure angle iron to bottom of furnace as shown.
Heavy−gauge sheet metal straps (plumber’s straps) may be used
to suspend the furnace from each bottom corner. To prevent
screws from pulling out, use 2 #8 x 3/4−in. (19 mm) screws into
the side and 2 #8 x 3/4−in. (19 mm) screws in the bottom of the
furnace casing for each strap. (See Fig. 15 and 16) If the screws
are attached to ONLY the furnace sides and not the bottom, the
straps must be vertical against the furnace sides and not pull away
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