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NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the unit operation, but we recommend it. CAUTION If using Method 2, make sure the furnace/air handler blower operation is synchronized with the unit operation! See Section 5. - 12 3. INSTALLATION (CONT’D) 3.7 CONNECTING THE DUCTS TO THE UNIT Insulated flexible ducts Use the following procedure for connecting the insulated flexible ducts to the port of the unit (Exhaust air to outsideand Fresh air from outsid