Monogram ZVB36 Installation Instructions Manual page 5

Clearances
• 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 fl oor. The assembly will fi t between 16"
fl oor joists. Order JXRB67 for indoor remote
locations.
• The blower motor assembly can also be installed
outdoors. Order JXBC67 for remote blower
installations outdoors.
• Refer to "Cooktop Clearances" for information on
appropriate placement and necessary clearances
when planning installation.
• Refer to your specifi c 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:
• 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 fl ame-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 have
18" minimum clearance between countertop and
cabinet bottom.
• Installation must conform with local codes.
Design Information
5
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 confi gurations.
• 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. Order
the cap in advance.
Electrical and Gas Locations
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' two foot long power cord.
• The vent and a Monogram gas cooktop combination
can operate from the same 120 volt standard duplex
outlet.
• Electric cooktops must operate from a separate
240 volt junction box.