Broan best IS42 Manual Del Usuario página 5

INSTALL THE DUCTWORK
NOTE: To reduce the risk of fire, use only
metal ductwork.
1. Decide where the ductwork will run between
the hood and the outside.
2. A straight, short duct run will allow the hood
to perform most efficiently.
3. Long duct runs, elbows, and transitions will
reduce the performance of the hood. Use as
few of them as possible.
4. Install a roof or wall cap. Connect 8" round
metal ductwork to cap and work back towards
hood location. Use duct tape to seal the joints
between ductwork sections.
INSTALL SUPPORT SYSTEM
1. At hood location, install 2 X 4 cross framing
between ceiling joists using dimensions
shown.
2. Finish the ceiling surface. Be sure to mark
the location of the ceiling joists and cross
framing.
3. Position the support frame as shown. The
UP ARROW should point towards the ceiling
after installation.
4. Secure the upper half of support frame to
joists and cross framing with four screws
provided (6x70mm) and four washers (D.
6.4mm). Make sure screws are driven into
center of joists and framing for maximum
strength.
5. Adjust the overall height of the support frame.
Loosen and re-tighten the 4 screws in the
height adjustment slots as necessary.
Insert 4 screws (3.9x9.5mm) and 4 washers
(D.4.5mm) located in the Hardware
Package.
Note that the hood height is 11" and that:
- on 8' ceilings, the bottom of the hood must
be 24" min. and 27" max. above the cooktop.
- on 9' ceilings, the bottom of the hood must
be 28" min. and 30" max. above the cooktop.
ROOF CAP
HOOD
24" TO 30" ABOVE
COOKING SURFACE
DRYWALL
9 13 / "
16
WASHERS
(Ø6.4mm)
MOUNTING
SCREWS
(6x70mm)
FRONT
SUPPORT FRAME
- 5 -
8" ROUND
DUCT
8" ROUND
ELBOW
EAVE
VENT
DECORATIVE
FLUE
CROSS FRAMING
CEILING
JOISTS
SUPPORT
HEIGHT
FRAME
ADJUSTMENT
SLOTS
TOP VIEW OF
9 13 / "
16
7 13 / "
16