Broan best IS170 Manual Del Usuario página 6

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. Larger ducting
may be required for best performance with
longer duct runs.
4. Install a roof or wall cap. Connect round
metal ductwork to cap and work back to-
wards 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 on center.
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 support frame to joists and cross
framing with four screws (6x70mm) and
washers provided. 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 screws
in the height adjustment slots as
necessary. Note that the hood height is 14-
3/16" (360mm) and that the bottom of the
hood must be 24" min. and 30" max. above
the cooktop.
TOP VIEW OF SUPPORT FRAME
9-13/16"
All manuals and user guides at all-guides.com
9-13/16"
CROSS FRAMING
- 6 -
ROOF CAP
ROUND
DUCT
ROUND
D E C O R A -
ELBOW
T I V E
HOOD
F L U E
24" TO 30" ABOVE
COOKING SURFACE
6" ADAPTER
CROSS FRAMING
DRYWALL
9 13 / "
16
MOUNTING
SCREWS
(6x70mm)
SUPPORT
FRAME
OPENINGS
SUPPORT
FRAME
FRONT
ADJUSTMENT
EAVE
VENT
CEILING
JOISTS
WASHERS
(Ø6.4mm)
HEIGHT
SLOTS