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Installation Instructions
8
ADVANCE PLANNING
DUCTWORK
Prepare ductwork to vent to the outdoors.
• Use the shortest and straightest duct run
possible.
The maximum permissible length for duct
run is 150 feet.
Refer to Duct Fittings chart to calculate
equivalent length for various duct
configurations.
• The downdraft blower system is designed
to use 3
1
⁄4″ x 10″ ductwork. It can be
transitioned to 6″ round.
• Ductwork MUST be vented to the outside—
never into a crawl space, attic or other
enclosed space.
• Determine the need for a wall cap or roof
cap. Purchase the cap in advance from
your home building center or plumbing
supply.
CLEARANCES
• Installation must conform with local codes.
• The downdraft system with blower, motor
and duct work will occupy the cabinet
below the countertop and cooktop.
• The blower/motor assembly can be located
below the cabinet floor. The assembly will
fit between 16″ floor joists.
In this installation a transition to 6 ″ round
is required.
• The blower motor assembly can also be
installed outdoors. Order JXBC67 for
remote blower installations outdoors.
• Refer to Dimensions and Clearances for
information on appropriate placement
and necessary clearances when planning
installation.
• Refer to your specific cooktop installation
instruction for other appropriate clearances.
• Avoid placing cabinetry directly above the
cooking surface when possible.
• If cabinetry is used above the cooking
surface:
Installation must conform with local codes.
Use cabinets no more than 13″ deep.
Maintain 30″ minimum clearance between
cooktop and unprotected cabinets directly
above cooktop.
If clearance is less than 30″, protect cabinet
bottoms with flame-retardant millboard at
least 1/4″ thick or gypsum board at least
3/16″ thick covered with 28 gauge sheet
steel or .02″ thick copper.
Clearance between cooktop and protected
cabinetry must not be less than 24″.
EXCEPTION: Installation of a listed
microwave oven or cooking appliance over
the cooktop shall conform to the installation
instructions packed with that appliance.
• Working areas adjacent to the cooktop
should maintain 18″ minimum clearance
between countertop and cabinet bottom.
COOKTOP ELECTRICAL AND
GAS LOCATION
Plan the placement of the electrical outlet
and gas (if used) carefully. Gas or electrical
outlets cannot be placed on the back wall of
the cabinet because it may interfere with the
downdraft plenum.
Install a standard electrical outlet within
reach of the vents’ 2 foot long power cord.
• The vent and a gas cooktop combination
can operate from the same 120V standard
duplex outlet.
• Electric cooktops must operate from
a separate 240V junction box.
REMOTE SWITCH
(for 36″ models only)
The downdraft vent has a separate
raise/lower switch. Plan to install the switch
in a convenient location outside of the
vent/cooktop cutout.