11
(see Figure 3) supplied with the duct connec-
tors is recommended for use with this type of
installation.
Selecting Duct Connector
Non Platinum Duct Connector
1. Determine depth of floor cavity from sur-
face of floor to top of supply air duct (see
Figure 5).
2. Select appropriate model from Table 4
which matches X-dimension of floor cavity.
To maximize air delivery, remove reducer
(C in Figure 5) to obtain largest open area
that will fit duct/floor construction.
NOTE: Duct connectors may be
installed in any one of four positions.
Platinum Duct Connector
1. The 14” round duct connector (903896) is
designed to connect directly to a 14” flex-
duct.
Preparing Floor Opening(s)
1. Mark floor opening(s) as shown in Figure
6. Provide minimum clearances at rear and
right side walls of closet or alcove for
installation of furnace and wiring.
2. Cut floor opening on outside edge of marked
line so that opening is slightly larger than
area marked.
2-3/8" MIN
(60 mm)
"
6-1/4
23-3/4"
(603 mm)
20
"
3/4"
"10
14-1/2"
(368 mm)
3" (76 mm)
"4-1/4 "5
"3-3/8
REAR WALL OF ENCLOSURE
Furnace Outer
Door
Optional Supply Wire
Entrance
Optional
Refrigerant
Line
(Not required
for Platinum)
Center Line
17"
(432 mm)
14-1/2"
(368 mm)
16-5/8"
(422 mm)
(254 mm)
(86 mm)
(127 mm)
(108 mm)
(159 mm)
(19 mm)
(508 mm)
3-3/4"
(95 mm)
Furnace
Outline
A/C Or HP
Figure 6. Downflow Floor Cutout Locations (nominal dimensions)
Table 4. Floor Cavity Sizes
If “X” Use Duct Connector
floor cavity is: Model Part Number
English Metric (mm) Finger Tab Screw Down
7/8" 22 901987 904008
2" 51 901988 904009
4 1/4" 108 901989 904010
6 1/4" 159 901990 904011
8 1/4" 210 901991 904012
10 1/4" 260 901992 904013
12 1/4" 311 901993 904014
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