GE PP989 Owner's Manual & Installation Instructions page 20

Installation Instructions
DUCTWORK INSTALLATION
(Note: For planning purposes only.)
[] INSTALLING THE DUCTWORK
Use galvanized or aluminum duct in 6" round or
31/4" 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
BetweenFloorJoist
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.
Use the shortest and straightest duct run possible.
Air Flow
-_ uct TapeOverSeam
andScrew
Screw
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.
InsideWall to Roof Direct to Outside
RearWall 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.
2O