MG3P Installation Manual

16
Bend tabs
up 90°
Mounting Plate
Duct
Connector
Connector
Tabs
Supply
Air Duct
Hole for
Gas Line
Wood Floor
Duct Connector
Supply
Air Duct
Bend tabs tightly
against supply air duct
Figure 14. Duct Connector Installed
Wood Floor
Left Plate
Right Plate
Front
Figure 15. Duct Connector Side Plates
10. Bend the connector tabs on the bottom of the duct connector
upwards and as tight as possible against the supply air duct.
11. Bend both tabs on the mounting plate (Figure 14) up 90°.
12. 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
Thes 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 16 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 16
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
The alternate attachment methods listed below 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 16.
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. See Figure
17 (page 16).
4. Secure the duct connector tabs to the supply air duct with
staples (3 minimum) or sheet metal screws (2 minimum).
Installing Screw-Down Duct Connectors
1. Bend both tabs (Figure 18) on the mounting plate up 90°.
2. Apply a bead of caulking, mastic, or other approved sealant
around bottom side of 1/2” flange and restrictor plate (when
applicable).
3. Locate the screw down duct connector over the duct and
carefully lower it into place. See Figure 18.
4. 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.
5. 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.
6. 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.
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 Ta bs
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 16. Narrow Ducts - Option 1
Figure 17. Narrow Air 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