GE PGP990 Owner's Manual & Installation Instructions page 23

Installatidff°l tructions
PREPARATION
PREPARE FOR DUCTWORK
NOTE: Ductwork MUSTbe 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 3¼" x 10" rectangular. Plan ducting
accordingly.
Typical duct arrangement countertop series.
*" :Inside wall
cabinet
Up inside wall to roof or
overhang
4¢ Peninsula or island
ii
i -=
Between floor joists
Outside wall
cabinet
Directly to outside
Peninsula
Through cabinet toe space
Optional duct arrangement under concrete slab.
PVCduct should be used if installing under a
poured concrete slab.
NOTE: PVCsower pipe type PSM 12454B
Schedule40ASTM D1785.
!_ 6"(15 cm)
Dia.90°
Metal Elbow
J
Wall Cap
4
3-1/4" x 10" Rectangular
to 6" RoundTransi8on
6"(15 cm}
Dia.Metal
6"(15 cm)
Dia. PVC
(15cm)
Dia. PVC
Coupling
6"(15 cm) Dia.
PVCSewer Pipe Packtightly with gravel
Elbow or sandcompletely
aroundpipe
Slab
6" (15 cm) Dia.
PVCSower Pipe
Elbow
(15cm)
Dia.
PVC
Coupling
6"(15 cm)
Dia.PVC
Sewer
Pipe
LOWER TO DUCTWORK ALIGNMENT
Ingeneral,the use of flexible ducting isdiscouraged
because it can cause severelyrestricted airflow.
However,if the blower outlet and the floor or wall duct
location do NOTalign well, then flexible METAL ducting
can be usedto adapt to an offset.Good alignment
without useof 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.
Offset
Bottom Venting Back Venting
(Requires 51/4" × 10")
A 3¼" x 10" rectangle to 6" round transition duct is
available at your local building supply store.
NOTE:Illustrations are for planning purposes only.
23