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5
Design Information
Professional Vent Hoods
Advance
Planning
Ductwork planning
•Determine the exact location of the vent hood.
•Plan the route for venting exhaust to the
outdoors.
•Use the shortest and straightest duct route
possible. For satisfactory performance, duct
run should not exceed 100 feet equivalent
length for any duct configurations.
•Refer to “Duct Fittings” chart to compute the
maximum permissable length for duct runs to
the outdoors. See page 6.
•Use metal ductwork. For 48" models,
3-1/4" x 24" or 10" round. For 30" and 36"
models, 7" to 10' round or 3-1/4" x 12" to
3-1/4" x 24".
•Install a wall cap with damper or roof cap at
the exterior opening.
Determine the size of the wall or roof cap for
your model and installation.
•Order the caps and any transitions needed in
advance. See “Duct and Duct Fittings” listed in
your local yellow pages. Be sure to include
equivalent lengths of caps and transitions when
calculating the total duct run. See “Duct
Fittings”, page 6.
48" Wide Model Duct Transitions
•Transition duct pieces are available for 48"
wide models. See illustrations of ZX48BY and
ZX48AY transition pieces on page 3.
Installation Framing for adequate support
These vent hoods are heavy. Adequate struc-
tural support must be provided. Hoods must be
secured to vertical studs or to studs in the
soffit.
•Additional studs may be required for a soffit
or wall mount installation. See Step 3, pages 8
and 9.
•We recommend that the vent hood and/or
duct cover be on site before final framing and
wall finishing. This will also help to accurately
locate the ductwork and electrical service.
•Installation will be much easier if the vent
hood is installed before the range or cooktop
below.
Decorative Duct Covers
Decorative duct covers are available for all
models. The duct covers conceal the ductwork
running from the top of the hood to the
ceiling or soffit. Duct covers are available in
6" or 12" heights.
You should:
•Determine the installation height from the
cooking surface.
– 36" max., 30" min.
•Measure 18" hood height.
•Select 6" or 12" duct cover to meet ceiling or
soffit height.
Electrical
Supply
CAUTION
Warning, for
Personal Safety:
Remove house fuse or open
circuit breaker before beginning
installation.
WARNING
Electrical supply
This vent hood must be supplied with 120V,
60Hz., and connected to an individual,
properly grounded branch circuit, protected
by a 15 or 20 ampere circuit breaker or time
delay fuse.
•Wiring must be 2 wire with ground.
•If the electrical supply does not meet the
above requirements, call a licensed electri-
cian before proceeding.
•Connect the wiring to the house wiring in
accordance with local codes.
House wiring location
•The junction box is located on the top of the
hood. See illustrations, page 10 to determine
exact placement.
•Route house wiring through the ceiling, soffit
or back wall as close to the installation location
as possible.
Grounding Instruction
This hood must be connected to a ground metal,
permanent wiring system, or an equipment-
grounding terminal or lead on the hood.
CAUTION
Warning: The improper connec-
tion of the equipment-grounding
conductor can result in a risk of
electric shock. Check with a
qualified electrician or service
WARNING
representative if you are in doubt whether
the appliance is properly grounded.
Do not use an extension cord or adapter
plug with this appliance. Follow National
electrical codes or prevailing local codes
and ordinances.
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