7
“X”
FLOOR OPENING
FLOOR
SUPPLY AIR DUCT
Figure 4. Floor Cavity
IF FLOOR CAVITY
“X” IS:
DUCT CONNECTOR
TYPE & PART NUMBER
STANDARD DUCT SCREW DOWN
7/8” / (22 mm) 901987A 904008
2” / (51 mm) 901988A 904009
4-1/4” / (108 mm) 901989A 904010
6-1/4” / (159 mm) 901990A 904011
8-1/4” / (210 mm) 901991A 904012
10-1/4” / (260 mm) 901992A 904013
12-1/4” / (311 mm) 901993A 904014
NOTE: Dimensions shown as Inches / (Millimeter)
Table 2. Duct Connector Sizes
6. Secure the duct connector and the mounting plate (if
using mounting plate on install) 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 6 (page 7).
8. Seal all connections with industrial grade sealing tape or
liquid sealant. See HUD Code 3280.715 for acceptable
standards for sealing products.
Narrow Duct Connectors
This attachment method should be used if there is
insufficient clearance to bend the tabs on a standard 12”
(305 mm) duct connector.
1. Score and cut the top of the supply air duct as indicated
in Option 1 or Option 2 (Figure 7). With Option 1 choice,
cut out the metal from the shaded area.
2. Fold the two flaps (Options 1 or 2) up to form the opening
for the duct connector.
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 supply
air duct. See Figure 8 (page 8).
5. Form the flaps (Options 1 or 2) up against the duct
connector as tight as possible.
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.
Round Duct Connector Installation
The 14” (355 mm) round duct connector is designed to
connect directly to a 14” (355 mm) flexible duct. NOTE:
Flexible ducts must meet all applicable codes and
standards.
1. Apply a bead of caulking, mastic, or other approved
sealant around bottom side of connector.
2. Install and center the duct connector in the floor opening.
3. Install the mounting plate under the back side of the
duct connector. See Figure 9 (page 8). NOTE: Align
the screw holes in both components.
PLATE
DUCT
OR
CONNECTOR
TABS
SUPPLY
AIR DUCT
WOOD FLOOR
Figure 5. Standard Duct Connector Installed
Figure 6. Duct Connector Tabs
DUCT CONNECTOR
SUPPLY
AIR DUCT
BEND TABS TIGHTLY
AGAINST SUPPLY AIR DUCT
Figure 7. Narrow Air Duct Openings
OPTION 1 OPTION 2
SUPPLY
AIR DUCT
FOLD FLAP HERE
FOLD FLAP HERE
REMOVE
THIS
FLAP
REMOVE
THIS
FLAP
CUT HERE
CUT HERE
CUT HERE
CUT HERE
CUT HERE
CUT HERE
CUT HERE
CUT HERE
CUT HERE
FOLD FLAP HERE
FOLD FLAP HERE
To Next Page
Loading...