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Fire Hazard
Venting system MUST terminate to the
outside.
Do Not terminate the ductwork in an attic or
other enclosed space.
Do Not use 4-inch laundry-type wall caps.
Do Not use plastic-type ductwork.
Use only metal ductwork.
Failure to follow these instructions
can result
in a fire.
To reduce risk of fire and to properly exhaust air,
be sure to duct air outside.
Do Not vent exhaust air into spaces within walls or
ceilings or into attics, crawl spaces or garages.
Before making cutouts, make sure there is proper
clearance within the wall or floor for the exhaust
duct.
Do Not cut a joist or stud unless absolutely
necessary. If a joist or stud must be cut, then a
supporting frame must be constructed.
Duct materials
needed for installation
are not
supplied.
Determine which venting method to use. See
"Venting methods," Page 2.
Next, determine the equivalent duct length using
chart on Page 3. The maximum equivalent duct
length is 60 feet.
The blower housing is set to vent straight out the
back from the cooktop. To vent down, left or right,
see "Preparation," Page 4.
This downdraft cooktop is rated at 60 feet of
straight duct or the equivalent.
l
If duct length is 10 feet or less, 6" diameter round
ductwork may be used.
l
If duct length is more than 10 feet, use 6"
diameter round or 3-l/4" x IO" rectangular duct.
Thermal breaks: In areas of extreme cold weather, it
may be necessary to provide a short length of
nonmetallic duct as close to the wall as possible to
prevent thermal conduction along the metal duct.
For altitudes above 4,500 ft, reduce recommended
duct run by 20%.
For the most efficient and
quietest operation:
l7J Use 26-gauge minimum galvanized or 25-gauge
minimum aluminum metal duct. Poor-quality
pipe fittings can reduce air flow. (Note: Local
codes may require a heavier-gauge material.)
Flexible metal duct is Not recommended.
iYJ Do Not exhaust more than one downdraft
cooktop into a single duct system.
j7J The length of duct and number of elbows
should be kept to a minimum to provide
efficient performance.
i7J The size of the duct should be uniform.
i7J Use the fewest number of 90" elbows.
i7J Do Not install two elbows together.
q
Make sure there is a minimum of 18' of straight
duct between the elbows if more than one
elbow is used. (Elbows too close together cause
excess turbulence that reduces air-flow.)
q
Do Not use a 5" elbow in a 6' or 3-l/4' x 10"
system.
q
Do Not reduce back to 5" system after using 6"
or 3-l/4" x 10" fittings.
q
Avoid forming handmade crimps. Handmade
crimps may restrict airflow.
i7J Use the recommended duct caps for proper
performance. If an alternate wall or roof cap is
used, be certain cap size is not reduced and that
it has a backdraft damper.
q
Use duct tape to seal all joints in the duct
system.
q
Use caulking to seal exterior wall or roof
opening around the cap.
Venting methods
g-314"
hole in rear or
side of cabinet
inside wall to roof
or overhang
The cooktop may be vented through the wall or floor.
Common venting methods and the types of materrals
needed are shown.
Make sure there is pro
floor for exhaust duct IT
er clearance within the wall or
efore makrng cutouts.
12" minimum
6" round
PVC sewer
co;n+;te
pipe,
W6"
round metal duct
Seal the space
between the
outside of wall
cap inlet inside
of PVC coupling
with caulking
matal.
\
Tightly pick gravel
6" round
or sand completely
PVC coupling
around pipe.
outside wall
cabinet
peninsula
or island
between
floor joists
6" round metal duct
peninsula
cabinet toe space
to outside
PVC sewer
Tis' -.
pipe elbow
or lntly pack gravel
sand completely
" round metal duct
6" round PVC coupling
\
30' maximum
rvb sewer
-I- - -IL -...
p,pa e)Ioow
around pipe..
optional
duct arrangement
through
window
well under concrete
slab
optional
duct arrangement
under concrete
slab
Page 2
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