Installation Manual

15
Figure 10. Ceiling Cut-Out Dimensions
CEILING CUT-OUTS FOR
VENT & COMBUSTION AIR
C
L
20"
23 3/4"
REAR WALL OF CLOSET OR ALCOVE
FURNACE
OUTER
DOOR
FURNACE OUTLINE
21 7/8
2 1/2
2 3/4
C
L
C
L
C
L
COMBUSTION
AIR INLET
EXHAUST
VENT
4. Determine which duct connector to use from the table.
5. Measure and drill gas hole and cut out for cooling coil
(if applicable). See Figure 9 or Figure 10.
Tabs slide into slots
in back of furnace
Mounting
Plate
Duct
Connector
Supply
Air Duct
Hole for
Gas Line
Wood Floor
Connector
Tabs
Duct Connector
Supply
Air Duct
Bend tabs tightly
against supply air duct
Figure 11. Finger Tabbed Duct Connector
Figure 12. Screw-Down Duct Connector
Cutting
Option A
Supply
Air Duct
Fold duct flap here
Remove
this Flap
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Cut Here
Fold Flap Here
Narrow
Duct
Narrow
Duct
Finger Tabs
Secure Flaps with Staples
or sheet metal screws
Fold duct flaps
into duct
connector
Remove
this Flap
Fold Flap Here
Cutting
Option B
Fold duct flap here
Supply
Air Duct
Locating & Cutting Ceiling Openings
IMPORTANT NOTE:
Cut-outs in the ceiling and roof must be carefully
located to avoid misalignment of the furnace,
combustion air piping, and vent piping. See Figure 10.
1. Measure from the rear wall or alcove and mark the
centerlines of both cut-outs in the ceiling.
2. Using the centerlines as a starting point, draw the rest
of the cut-outs to the dimensions shown in Figure 10.
3. Cut out the ceiling openings.
Installing Finger Tabbed Duct Connectors
The standard duct connector is designed for use on
ducts 12” in width. Ducts narrower than 12” may not allow
sufficient clearances for this type of installation. For an
alternate installation method, see page 15.
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 of the duct connector.
3. Remove the duct connector and cut out the marked
area of the supply air duct 1/16” larger the actual cutout
drawn. See Figure 11.
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 11) 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. See Figure 11.
8. 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.
Narrow Duct Attachment - Option 1
These alternate attachment methods may be used to
install a furnace duct connector to narrow metal ductwork
if insufficient clearances prevent the bending of the duct
connector tabs at the side of the duct.
1. Select Option A or Option B in Figure 12 and cut the
top of the supply air duct. Remove metal flaps from the
duct (shaded area) if Option A is selected.
2. Fold the duct flaps up to form an opening for the duct
connector (applies to Options A or B).
3. Install the duct connector with the bottom tabs extending
into the supply air duct.
4. Bend the tabs on the bottom of the duct connector
upwards and as tight as possible against the removed
ends of the supply air duct.
5. Form the duct flaps up against the side of the duct
connector as tight as possible. See Figure 12.
6. Secure the duct connector flaps to the supply air duct
with staples (3 minimum) or if a 2x block/joist is not
provided, use sheet metal screws (2 minimum).