3
Two mounting slots are provided in each bracket. To
mount extension on right side, adjust bracket so the
screws are in left side of bracket slots; for mounting
extension on the left, adjust brackets so the screws are
in right side of slots.
On right side extensions shift the brackets to the right
(Figure 10).
End
Cap
Brackets Shifted Right
#8 Round
Phillips Head
Mounting
Screws (4)
Bracket Extends
Beyond Duct
Slots
Figure 10
Right Side Extensions
For left side extensions shift the brackets to the left.
(Figure 11)
Brackets Shifted Left
End
Cap
#8 Round
Phillips Head
Mounting
Screws (4)
Slots
Bracket Extends
Beyond Duct
Figure 11
Left Side Extensions
Airflow Baffle Installation
1. Determine amount of air desired at main duct and at
extension duct. See Table 1 to select the appropriate
baffle.
2. Place baffle on grille support brackets on main duct. The
baffle must be placed so that the two extruded holes are
on top of the two front bracket holes (Figure 12).
Air Flow
Baffle
Dimensions
Main Duct Ext. Duct
Small
3-11/16" x 31-3/4"
80%
20%
Large
4-5/16" x 31-3/4"
65%
35%
Table 1
Grille Support Brackets
Figure 12
Front Bracket
3. Install discharge air grille (Figure 13) on top of the air
baffle. Secure the grille to the duct with pal nuts (provided)
by reaching through the opening in the bottom of the
duct.
Figure 13
Air Grille
4. Place main duct assembly on the transition. Secure the
brackets to the wall sleeve with four #10 hex head
screws.
Do not apply pressure on top of duct during this
installation!
5. Install two Phillips head screws into the top flange of the
main supply duct (where the extension duct is to be
connected, see Figure 14). Do not tighten screws.
Leave space for one thickness of the duct sheet metal
between screw head and main duct flange.
#10 Round
Phillip Head
Screws
#8 Round
Phillip Head
Screws
Figure 14
Main Supply Duct Top Flange
Note: Total length of duct extension assembly, includ-
ing field supplied duct between main and extension
duct, should not exceed 15 effective feet (according to
ASHRAE standards). For additional dimensions, refer
to Figure 16.