Broan Alta ALT4 Series Installation Use And Care Manual page 13

3¼" x 10" OR 7" ROUND DUCTED INSTALLATION ONLY
8 ] Remove 3¼" x 10" vertical, 3¼" x 10" horizontal (both are the rectangular central
knockout plates, see hatched areas) or 7-inch round knockout plate as appropriate for
your ducting method (see F
F 1 A
IGURE
7" ROUND KNOCKOUT
PLATE (
ALSO REMOVE
3¼" 10"
X VERTICAL
)
KNOCKOUT PLATE
3¼" 10"
X
VERTICAL
KNOCKOUT
PLATE
9 ] Attach 3¼" x 10" Damper Assembly on top OR back of hood (if using 3¼" x 10" duct; shaded
part in F 2 A below) or 7" Round Duct Plate (if using 7-inch round duct, F
IGURE
the knockout opening. When installed, the 3¼" x 10" damper assembly must open as shown
in F 2 B.
IGURE
F 2 A
IGURE
SCREWS
3¼" 10"
X
DAMPER
ASSEMBLY
SCREWS
3¼" 10"
X
DAMPER
ASSEMBLY
NOTE: To accommodate off-center ductwork, the 7" round duct plate can be installed up
to 1/2" on either side of the hood center.
TIP: Insert a small length of duct over the 3¼" x 10" damper assembly (for rectangular ducting) or
7" round (for round ducting) and seal the joint using aluminum foil duct tape to ease connection
with the house ductwork.
1 A and 1 B).
IGURES
3¼" 10"
X
HORIZONTAL
KNOCKOUT
PLATE
F 3
IGURE
SCREWS
F 1 B
IGURE
F 2 B
IGURE
TOP/BACK
EDGE OF
HOOD
BACK OF
HOOD
7" ROUND
DUCT
PLATE
3) over
IGURE
DAMPER
FLAP
PIVOT
DAMPER
FLAP
PIVOT
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