22OPTIONAL INSTALLATION:REAR WALL VENTING5″ round duct may be used on SHORT DUCTruns of 3 feet or less, such as direct to outsidewall venting.To convert blower exhaust direction, removefour nuts behind the filter which hold blowerand wire finger guard.Rotate blower and reinstall to vent chamber,as shown above. Retighten nuts, but do notovertighten.INSTALLING THE DUCTWORKUse galvanized or aluminum duct in 6″ roundor 3 1⁄4″ x 10″ size, or a combination of both.PVC duct should be used if installing under apoured concrete slab.NOTE: Local building code must be followedin specifying approved type and schedule ofALL duct used.Always use an appropriate roof or wall capwith damper. Laundry-type wall caps shouldNEVER be used.Install ductwork, making male-femaleconnections in the direction of airflow asshown. Secure all joints with sheet metalscrews and duct tape to assure an airtightseal.Use the shortest and straightest duct runpossible. For satisfactory performance theduct run should not exceed 100 feetequivalent length. Refer to TABLE 1 ofequivalent lengths. Use TABLE 1 to calculatethe total equivalent length of the ductwork.Through Cabinet Toe Space Between Floor JoistDownward VentingDuct Tape Over Seamand ScrewAir FlowInside Wall to Roof Direct to OutsideRear Wall VentingScrew6Installation InstructionsDUCTWORK INSTALLATION(Note: For planning purposes only.)