GE PGP990DENBB Owner's Manual & Installation Instructions page 23

6
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.
The downdraft air discharge outlet
for this unit is 3 " x 10" rectangular. Plan ducting
1 4
accordingly.
Typical duct arrangement countertop series.
Inside wall
cabinet
Up inside wall to roof or
overhang
Peninsula or island
Between floor joists
NOTE: PVC sewer pipe type PSM 12454-B
Schedule 40 ASTM D1785.
Wall Cap
12"
(30 cm)
Min.
6"
(15 cm)
Dia. PVC
Coupling
6" (15 cm) Dia.
Pack tightly with gravel
PVC Sewer Pipe
or sand completely
Elbow
around pipe
Outside wall
cabinet
Directly to outside
Peninsula
Through cabinet toe space
3-1/4" x 10" Rectangular
6" (15 cm)
to 6" Round Transition
Dia. 90°
Metal Elbow
6" (15 cm)
Dia. Metal
Duct
Concrete
6" (15 cm) Dia. Slab
Metal Duct
16"
6" (15 cm)
(40.6 cm)
Dia. PVC
Max.
Sewer Pipe
(15 cm)
Coupling
30'-0" (9.14 m) Max.
6" (15 cm)
Dia. PVC
Sewer
6" (15 cm) Dia.
PVC Sewer Pipe
Elbow
7
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.
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.
A 3
1 4
available at your local building supply store.
6"
Dia.
PVC
Pipe
23
Centerline
to Centerline
Offset
Bottom Venting
" x 10" rectangle to 6" round transition duct is
Illustrations are for planning purposes only.
Back Venting
/ " x 10")
1
4