MG2S Installation Manual

16
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
Narrow Duct Attachment - Option 1
This alternate attachment method 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).
NOTE: The duct connector tabs may be attached to
the air duct with sheet metal screws or other suitable
fasteners as long as the duct connector and the air duct
are securely attached.
7. 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 2
This alternate attachment method 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. Cut and remove the top of the supply air duct as shown
in Figure 13.
2. Install the duct connector with the bottom tabs extending
into the supply air duct.
3. Bend the tabs on the bottom of the duct connector
upwards and as tight as possible against the supply
air duct (Figure 13).
4. Secure the duct connector tabs to the supply air duct
with staples (3 minimum) or sheet metal screws (2
minimum).
Figure 13. Narrow Ducts - Option 2
Narrow
Duct
Finger Tabbed
Duct Connector
Secure finger tabs to
side of air duct with staples
or sheet metal screws
Bend tabs tightly
against supply air duct
Supply Air Duct
Cut out & remove
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
Figure 12. Narrow Air Ducts - Option 1
Installing Screw-Down Duct Connectors
1. Apply a bead of caulking, mastic, or other approved
sealant around bottom side of 1/2” flange and restrictor
plate (when applicable). See Figure 14
2. Locate the screw down duct connector over the duct
and carefully lower it into place.
3. Secure the duct connector to the floor using flat head
screws or nails. NOTE: Make sure the duct connector
flanges stay in contact with the duct.
4. Secure the plenum to the duct using sheet metal screws
making sure a tight seal is made between the duct and
the duct connector. NOTE: Additional screws may be
added if required.
5. Cut away along edge of flange allowing the center to
drop into the duct. NOTE: Remove section of duct with
caution, as edges will be sharp.
Round Duct Connector Installation
1. Install and center the duct connector in the floor opening.
2. Install the mounting plate (Figure 15 (page 17)) under
the back side of the duct connector. NOTE: Make sure
the screw holes are aligned in both components.
3. Using appropriate size screws, secure the duct
connector and the mounting plate to the wood floor.
4. Connect the round supply duct to the underside of the
duct connector and secure them with field supplied
sheet metal screws or appropriate clamps.
5. Seal all connections with industrial grade sealing tape
or liquid sealant as required.
NOTE: Requirements for sealing ductwork vary
from region to region. Consult with local codes for
requirements specific to your area.