GE JP989 Series, Technical Service Manual, Page: 16 / 39

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Ductwork Installation
Step 6 – Installing the Ductwork
Note: Local building code must be followed in
specifying approved type and schedule of all duct
used.
Use galvanized or aluminum duct in 6-in. round or
3-1/4-in. x 10-in. size, or a combination of both.
PVC duct should be used if installing under a
poured concrete slab.
Always use an appropriate roof or wall cap with a
damper. Laundry-type wall caps should never be
used.
Install ductwork, making male-female connections
in the direction of airflow as shown. Secure all
joints with sheet metal screws and duct tape to
assure an airtight seal.
Use the shortest and straightest duct run possible.
For satisfactory performance, the duct run should
not exceed the equivalent ductwork length of 100
ft. Use Table 1 to calculate the total equivalent
length of the ductwork.
Optional Installation: Rear Wall Venting
Rear wall venting requires a special offset duct
adapter (JXRW89) that is not included with your
cooktop. This adapter has a 5-in. diameter outlet
for rear wall and retrofit installations.
A 5-in. round duct may be used on short duct runs
of 3 ft or less, such as direct to outside wall venting.
To convert blower exhaust direction, remove
7/16-in. nuts (behind the filter) that hold blower
and wire finger guard. Remove blower and install
Special Offset Adapter Kit JXRW89 with sheet
metal screws.
Rotate blower and reinstall to vent chamber, as
shown above. Retighten nuts, but do not over-
tighten.
Thru Cabinet Toe Space Between Floor Joist
Downward Venting
GEA00204
Duct Tape Over Seam
and Screw
Air Flow
Screw
GEA00205
Inside Wall to Roof Direct to Outside
Rear Wall Venting
GEA00206
4 Nuts
Behind Filter
required)
(7/16"socket
GEA00306