WARNING
Fire Hazard
The venting system must terminate outdoors.
Do not end the ductwork in an attic, wall,
ceiling, or other enclosed space.
Do not use 4 " laundry-type wall caps.
Do not use plastic duct.
Do not block the flow of ventilation air.
Failure to follow these instructions could
result in a fire.
Before making any cutouts, make sure that
there is proper clearance within the wall or
floor for the exhaust duct. Do not cut a joist
or stud unless it is absolutely necessary. If
a joist or stud must be cut, a supporting
frame must be constructed.
This downdraft cooktop is rated for 60-feet of
straight duct. If duct length is 10 feet (3 m) or
less, 5 " diameter round ductwork may be used.
If duct length is more than 10 feet (3 m), use 6 "
diameter round or 3-
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.
High Altitudes: For altitudes above 4,500 ft
(1,350 m), reduce the recommended duct run
by 20%.
VENTING REQUIREMENTS
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/
" x 10 " rectangular duct.
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For the quietest and most efficient operation:
•
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.
•
Do not exhaust more than one downdraft
cooktop into a single duct system.
•
Keep the length of duct and number of
elbows to a minimum.
•
Keep the size of the duct uniform.
•
Use no more than three 90˚ elbows.
•
Do not install two elbows together.
•
If more than one elbow is used, make sure
that there is a minimum of 18 " (45.7 cm) of
straight duct between them. If elbows are
too close together, they can reduce air-
flow.
•
Do not use a 5 " elbow in a 6 " , or a 3-
x10 " system. Use a 5 " to 6 " transition fol-
lowed by a 6 " elbow, or a 5 " to 3-
elbow transition.
•
Do not reduce the duct work back to a 5 "
system after using 6 ", or 3-
tings.
•
Do not form handmade crimps. They can
restrict airflow.
•
Use recommended duct caps. If an alter-
nate wall, or roof cap is used, be certain
that the cap size is not reduced, and that it
has a backdraft damper.
•
Use duct tape to seal all joints in the duct
system.
•
Use weatherproof caulking to seal the ex-
terior wall or roof opening around the cap.
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1
/
"
4
1
/
" x10 "
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1
/
" x10 " fit-
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