GE JGP985 Owner's Manual & Installation Instructions page 23

6 PREPARE FOR DUCTWORK
NOTE: Ductwork MUST be vented outside. DO
NOT vent into a wall, ceiling, crawlspace, attic or
any concealed space.
Determine the best route for ductwork; it can be
routed in a variety of ways depending on the
kitchen layout.
IMPORTANT: The downdraft air discharge outlet
for this unit is 3-1/4" x 10" rectangular. Plan
ducting accordingly.
Typical duct arrangement countertop series.
Inside wall
cabinet
Up inside wall to roof
or overhang
Peninsula or island
Between floor joists
Optional duct arrangement under concrete slab.
PVC duct should be used if installing under a
poured concrete slab.
NOTE: PVC sewer pipe type PSM 12454-B
Schedule 40 ASTM D1785.
6" (15 cm)
Dia. 90°
Metal Elbow
Wall Cap
6" (15 cm) Dia.
Metal Duct
12" 16"
(40.6 cm)
(30 cm)
Max.
Min.
6"
(15 cm)
Dia. PVC
Coupling
6" (15 cm) Dia.
Pack tightly with gravel
PVC Sewer Pipe
or sand completely
Elbow
around pipe
Installation Instructions
PREPARATION
Outside wall
cabinet
Directly to outside
Peninsula
Through cabinet toe space
3-1/4" x 10" Rectangular
to 6" Round Transition
6" (15 cm)
Dia. Metal
Duct
Concrete
Slab
6" (15 cm)
Dia. PVC
Sewer Pipe
6"
(15 cm)
Dia.
PVC
Coupling
30'-0" (9.14 m) Max.
6" (15 cm)
Dia. PVC
Sewer
Pipe
6" (15 cm) Dia.
PVC Sewer Pipe
Elbow
7 BLOWER TO DUCTWORK
ALIGNMENT
In general, the use of flexible ducting is discouraged
because it can cause severely restricted airflow.
However, if the blower outlet and the floor or wall duct
location do NOT align well, then flexible METAL
ducting can be used to adapt to an offset. Good
alignment without use of flexible ducting is best.
NOTE:
Do not exceed the maximum recommended
offset of 6".
Do not allow the flexible ducting to kink or
collapse.
Do stretch the flexible ducting as much as
possible to eliminate as much of the corrugation
as possible.
Bottom Venting
" x 10" rectangle to 6" round transition duct
A 3 1 ⁄
4
is available at your local building supply store.
NOTE: Illustrations are for planning purposes only.
23
6" Max.
Centerline
to Centerline
Offset
Back Venting
" x 10")
(Requires 3 1 ⁄
4