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Design Information
Gas Downdraft Cooktop
Advance
Planning
Clearances
•The downdraft system with blower, motor
and ductwork will occupy the cabinet below
the cooktop. Drawers cannot be installed
below this cooktop.
•Refer to “Dimensions & Clearances” for
information on appropriate placement and
necessary clearances when planning installa-
tion.
•Avoid placing cabinetry directly above the
cooktop when possible.
•If cabinetry is used above cooking surface:
–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 micro-
wave oven or cooking appliance over the
cooktop shall conform to the installation
instructions packed with that appliance.
–Working areas adjacent to the cooktop
should have 18" minimum clearance be-
tween countertop and cabinet bottom.
•Installation must conform with local codes.
In the absence of local codes, the gas cooktop
must comply with the National Fuel Gas Code,
ANSI Z223.1, latest edition.
Ductwork Advance Planning
Prepare ductwork to vent to outdoors:
•Use the shortest and straightest duct run
possible:
–Duct run should not exceed equivalent
length of 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"x10" 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. Order the cap in advance.
Gas and Electrical Locations
Plan the placement of the electrical outlet and
gas carefully. Gas and electrical outlets cannot
be placed on the back wall of the cabinet
because it may interfere with the downdraft
plenum.
•Refer to “Power Supply Locations” page 8 for
details.
The combined installation of a downdraft vent
and cooktop require careful consideration.
Countertop Requirements:
The countertop must have a deep flat surface
to accommodate the cooktop and the vent.
Countertops with a rolled front edge and
backsplash may not provide the flat surface
area required.
Base Cabinet Requirements:
This installation requires a 24" min. deep
cabinet base. The cabinet must be at least 36"
wide.