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Figure 1
UNIT
Dimensions and Clearances
1
28
/
(724)
2
11
(17)
/
16
TOP
(233)
1
3
18
/
9
/
2
16
(470)
7
3
/
8
(19)
(98)
3
/
4
LEFT SIDE
15
4
/
16
(125)
BOTTOM
D
1
8
/
5
4
16
/
11
/
8
16
(210)
(422)
(17)
Furnace Installation
Inspect the rating plate to be certain the model number begins with
"*8DNL". This identifies the furnace as a dedicated downflow fur-
nace that is permitted to be Installed in a Downflow position. (see
Figure 2).
* Denotes Brand
Downflow
The minimum clearances to combustible material MUST be main-
tained between the furnace and adjacent construction, as shown
in Figure 1.
441 01 2314 06
water
heater
A
C
30"
(762)
13
(97)
3
/
16
A
1
1
/
16
(27)
13
2
/
16
(71)
FRONT
15
24
/
16
(633)
1
(232)
9
/
8
ALL DIMENSIONS in(mm)
1 in = 25.4 mm
DIMENSIONAL INFORMATION
Cabinet
Unit
Capacity
A
*8DNL050B12
1
15
/
2
*8DNL075B12
(394)
*8DNL075F16
1
19
/
8
*8DNL100F14
(486)
*8DNL100L20
24
1
/
2
*8DNL125L20
(622)
* Denotes Brand
Drawing is representative, some models may vary in appearance
Specifications are subject to change without notice.
(*8DNL)DIMENSIONS
MINIMUM CLEARANCES TO COMBUSTIBLE
REAR
FRONT
Recommended For Service
ALL SIDES Of SUPPLY PLENUM
SIDES
VENT
Single Wall Vent
Type B−1 Double Wall Vent
TOP OF FURNACE
Horizontal position: Line contact is permissible only between lines
B
11
/
16
formed by intersections of top and two sides of furnace jacket, and
(17)
building joists, studs or framing.
Top
Bottom
B
C
D
5
1
14
5
/
14
/
16
8
(356)
(135)
(359)
5
3
11
17
/
7
/
17
/
8
4
16
(447)
(197)
(449)
7
1
23
10
/
23
/
16
8
(584)
(265)
(587)
!
FIRE HAZARD
Failure to follow this warning could result in
personal injury, death and/or property damage.
Place furnace on noncombustible subbase on
downflow applications, unless installing on
noncombustible flooring.
In addition to clearances in Figure 1, clearance for the vent pipe
must be considered.
A subbase for combustible floors MUST be used when the furnace
is installed on combustible material. See "Ductwork and Filter".
MATERIALS FOR ALL UNITS
3
9
/
16
7
3
/
(233)
8
(98)
1
1
/
16
(27)
3
2
/
16
RIGHT SIDE
(56)
15
24
/
16
(633)
1
12
/
16
(306)
3
3
/
4
(95)
NOTE: Evaporator "A" coil drain pan dimensions
may vary from furnace duct opening size. Always
consult evaporator specifications for duct size
requirements.
Unit is designed for top return ONLY.
Return air through back of unit is NOT allowed.
WARNING
0
3" (76 mm)
30" (762 mm)
1" (25 mm)
0
6" (152 mm)
1" (25 mm)
1" (25 mm)
1
18
/
2
(267)
40
(1016)
25−24−15a−1
5
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