GE PGP990 Owner's Manual & Installation Instructions page 23

Installation Instructions
PREPARATION
[] 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 5-1/4" x 10" rectangular. Plan ducting
accordingly.
Typical duct arrangement countertop series.
j _" Outside wall
" :Inside wall cabinet
cabinet
r---
)
Up inside wall to roof Directly to outside
or overhang
L
!_Peninsula or island
Peninsula
Between floor joists Through cabinet toe space
Optional duct arrangement under concrete slab.
PVCduct should be used if installing under a poured
concrete slab.
NOTE: PVCsewer pipe type PSM 12454B
Schedule40ASTM D1785.
Wall Cap
8-_
(15cm)
Dia. PVC
Coupling ii
8"115cm)Dia.
PVCSower Pipe
Elbow
6" (15 cm) 3-I/4" x 10" Rectangular
Dia.go° to 6" RoundTransition
_---3 Metal Elbow _ 6"(15cm)
............ _ _ Dia.lvletal
_l Concrete ' Duct I
_.J I 6"(15cm)Dia. Slab r-_-] I
;6" 6"(15cm, l' I
I _1 i I (40.6cm)Dia. PVCI I _t -_
L4 rJVMax s....P_po , !, M-_
_, ..... Vo 8"
'4:_ I ' i,/_ PVC
.._--T_,¢/
,_/_-." il,
"
/,, "/ ' "" " / ..... Pipe
6" (15 cm) Dia.
Packtightly with gravel PVCSower Pipe
or sandcompletely Elbow
aroundpipe
r71
23
BLOWER TO DUCTWORK
ALIGNMENT
In general,the useof flexibleducting is discouraged
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 used
to adapt to an offset.Good alignment without useof
flexibleducting 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
Back Venting
(Requires 3VJ' x i0")
A 31/4" x 10" rectangle to 6" round transition duct
is available at your local building supply store.
NOTE:Illustrations are for planning purposes only.