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FURNACE
CASING
WIDTH
In. (mm)
PLENUM OPENING
FLOOR OPENING
Table 1 - Opening
Dimensions
APPLICATION
(APPROVED
FACTORY SUPPLIED CASED COILS AND
COiL BOX: CD5, CKR, CAPVP, CARVP, CAPMR CARMR
CNPVR CNRVR AND KCAKC)
Upflow Applications on Combustible
or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible
Flooring (KGASB
subbase not required)
Downflow applications
on combustible
flooring (KGASB sub-
base required)
Downflow Applications on Combustible
Flooring with Factory
supplied cased coil or Factory supplied coil box (KGASB
subbase not required)
Upflow Applications on Combustible
or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible
Flooring (KGASB
subbase not required)
Downflow applications
on combustible
flooring (KGASB sub-
base required)
Downflow Applications on Combustible
Flooring with Factory
supplied cased coil or Factory supplied coil box (KGASB
subbase not required)
Upflow Applications on Combustible
or Noncombustible
Flooring (KGASB subbase not required)
Downflow Applications on Noncombustible
Flooring (KGASB
subbase not required)
Downflow applications
on Combustible
flooring (KGASB
subbase
required)
Downflow Applications on Combustible
Flooring with Factory
supplied cased coil or Factory supplied coil box (KGASB
subbase not required)
A
B
C
D
16
24-1/8
16-
5/8
24-
3/4
(406)
(613)
(422)
(629)
15-
7/8
19
16-1/2
19-
5/8
(403)
(483)
(419)
(498)
17 ½
15-1/8
19
16-3/4
20-3/8
(445)
(384)
(483)
(425)
(518)
15-1/2
19
16-1/2
20
(394)
(483)
(419)
(508)
19-1/2
24-1/8
20-1/8
24-3/4
(495)
(613)
(511 )
(629)
19-3/8
19
20
19-5/8
21
(492)
(483)
(508)
(498)
(533)
18-
5/8
19
20-1/4
20-
3/8
(473)
(483)
(514)
(518)
19
19
20
20
(483)
(483)
(508)
(508)
23
24-1/8
23 - 5/8
24-
3/4
(584)
(613)
(600)
(629)
22 - 7/8
19
23 - 1/2
19-
5/8
24 - 1/2
(581)
(483)
(597)
(498)
(622)
22 - 1/8
19
23 - 3/4
20-
3/8
(562)
(483)
(603)
(518)
22-1/2
19
23-1/2
20
(572)
(483)
(597)
(508)
AIR
DUCTS
General
Requirements
The duct
system
should
be
designed
and sized
according
to
accepted
national
standards
such
as those
published
by:
Air
Conditioning
Contractors
Association
(ACCA),
Sheet
Metal and
Air Conditioning
Contractors
National
Association
(SMACNA)
or
American
Society
of
Heating,
Refrigerating
and
Air
Conditioning
Engineers
(ASHRAE)
or consult
The Air Systems
Design
Guidelines
reference
tables
available
from
your
local
distributor.
The
duct
system
should
be
sized
to
handle
the
required
system
design CFM at the design
static pressure.
When
a furnace
is installed
so that
the supply
ducts
carry
air
circulated
by the furnace
to areas outside
the space containing
the
furnace,
the return air must also be handled
by a duct(s)
sealed to
the furnace
casing
and ternfinating
outside
the space
containing
the furnace.
Secure ductwork
with proper
fasteners
for type of ductwork
used.
Seal supply-
and return-duct
connections
to furnace
with code
approved
tape or duct sealer.
Flexible
connections
should
be
used
between
ductwork
and
furnace
to prevent
transnfission
of vibration.
Ductwork
passing
through
unconditioned
space
should
be insulated
to enhance
system
performance.
When
air conditioning
is used,
a vapor
barrier is recommended.
Maintain
a 1-in.
(25 ram)
clearance
from combustible
materials
to supply
air ductwork
for
a distance
of 36
in. (914
ram)
horizontally
from
the furnace.
See NFPA 90B or local
code for
further requirements.
For a furnace
not equipped
with
a cooling
coil, the outlet duct
shall be provided
with
a removable
access
panel.
This opening
shall be accessible
when
the furnace
is installed
and shall be of
such a size that the heat exchanger
can be viewed
for possible
openings
using
light assistance
or a probe
can be inserted
for
sampling
the air stream.
The cover attachment
shall prevent
leaks.
Ductwork Acoustical Treatment
Metal duct systems that do not have a 90 degree elbow and 10 ft.
(3M) of main duct to the first branch take-off may require
internal acoustical lining. As an alternative, fibrous ductwork may
be used if constructed and installed in accordance with the latest
edition of SMACNA
construction standard on fibrous glass
ducts. Both acoustical lining and fibrous ductwork shall comply
with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid
air ducts.
Supply Air Connections
Upflow Furnaces
Connect supply-air
duct to 3/4-in. (19 ram)flange on furnace
supply-air outlet. The supply-air duct attachment nmst ONLY be
connected
to furnace supply-/outlet-air
duct flanges or air
conditioning coil casing (when used). DO NOT cut main furnace
casing to attach supply
side air duct, hunfidifier,
or other
accessories. All accessories
MUST be connected
external to
furnace main casing.
Downflow Furnaces
Connect supply-air
duct to supply-air
opening on furnace. The
supply-air duct attachment nmst ONLY be connected to furnace
supply/outlet or air conditioning
coil casing (when used) when
installed
on non-combustible
material
When
installed
on
combustible material, supply air duct attachment nmst ONLY be
connected
to an accessory subbase
or factory approved
air
conditioning
coil casing.
DO NOT cut main furnace casing to
attach supply side air duct, hunfidifier, or other accessories. All
accessories MUST be connected external to furnace main casing.
Supply air opening duct flanges must be modified per Fig. 22.
Horizontal
Furnaces
Connect supply-air
duct to supply-air
opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning
coil casing (when used). DO
NOT cut main furnace casing to attach supply side air duct,
21
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