GE PP989 Owner's Manual And Installation Instructions page 18

Installation Instructions
DUCTWORK INSTALLATION
(Note: For planning purposes only.)
171INSTALLING THE DUCTWORK
Use galvanized or aluminum duct in 6" round or 3VJ'
x 10" size, or a combination of both.
PVC duct should be used if installing under a poured
concrete slab.
NOTE: Local building code must be followed in
specifying approved type and schedule of ALL
duct used.
Always use an appropriate roof or wall cap with
damper. Laundry-type wall caps should NEVER
be used.
Through Cabinet Toe Space
Between Floor Joist
Downward Venting
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.
Air Flow
-J uct Tape Over Seam
and Screw
Screw
Use the shortest and straightest duct run possible.
For satisfactory performance, the duct run should
not exceed :100 feet equivalent length. Refer to the
"DUCTWORK CALCULATIONS" chart for equivalent
lengths. Use this chart to calculate the total
equivalent length of the ductwork.
OPTIONAL INSTALLATION:
REAR WALL VENTING
5" round duct may be used on SHORT DUCT runs,
but best results will be obtained using 31/4' ' x 10"
or 6" round ducting.
Inside Wall to Roof
Direct to Outside
Rear Wall Venting
To convert blower exhaust direction, remove four
nuts behind the filter which hold blower and wire
finger guard.
Rotate blower and reinstall to vent chamber, as
shown above. Retighten nuts, but do not overtighten.
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