GE PP989SNSS Use and Care Manual - Page 20

Installation Instructions Ductwork installation (Note: For planning purposes only.) 7 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. 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. 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 Duct tape over seam and screw 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. 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. 20