201" _
14 1/2"_ 2 3/4"
C'_ J Z CUT-OUTFOR 1 3/4"
I _ I CL ¢'- / OPTIONAL ¢_ /
1 3/4"_i: :::_ :A:L;:F; ELIL,; E _ _'
3/4"_ _ ENTRY 1 1/4" Dia, \\ LINE
17/8"_ _ FURNACE
2 7/8"_ _ DOOR
Figure 6. Cut=Out Dimensions for
Standard Duct Connectors
±
_J_/_ FLOOR OPENING !._'
"X" _ _,/,I
FLOOR
CAVITY
Figure 9. Floor Cavity
if Floor Cavity
"X" is:
7/8"/(22)
2"/(51)
4-1/4" / (108)
6-1/4"/(159)
8-1/4" / (210)
10-1/4" / (260)
12-1/4"/(311)
Duct Connector
Type & Part Number
Standard Duct
901987A
901988A
901989A
901990A
901991A
901992A
901993A
Round Duct
904008
904009
904010
904011
904012
904013
904014
Note: Dimensions shown as Inches / (Millimeter_
Table 3. Duct Connector Sizes
Figure 7. Cut=Out Dimensions for
Round Duct Connectors
Hole for
Gas Line
Mounting Plate
Duct
Connecto
Figure 8. Standard Duct Connector In-
stalled
Standard Duct Connector installation
The standard duct connector is designed for use
on ducts 12" in width. However ducts narrower
than 12" may not allow sufficient clearances
for this type of installation. For an alternate
installation method, see page 10.
1. Center the duct connector in the floor opening
with bottom tabs resting on top of the supply
air duct.
2. Mark the cut-out area on the supply air duct by
tracing around the connector tabs (Figure 8) of the
duct connector.
3. Remove the duct connector and cut out the
marked area of the supply air duct 1/4" larger
the actual cutout drawn.
4. Install the duct connector back in the floor
opening with the bottom tabs extending into
the supply air duct.
5. Install the mounting plate (Figure 8) under
the back side of the duct connector. Align the
screw holes in both components.
6. Secure the duct connector and the mounting
plate to the wood floor with appropriate size
screws.
7. Bend the connector tabs on the bottom of
the duct connector upwards and as tight as
possible against the supply air duct.
8. Bend both tabs on the mounting plate up 90 °.
See Figure 10, (page 10)
9. Seal all connections with industrial grade
sealing tape or liquid sealant.
NOTE: Requirements for sealing ductwork
vary from region to region. Consult with local
codes for requirements specific to your area.
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