How to Fix a Leaking Air Duct. 1 Step 1 – Check. Turn the thermostat fan switch to ON rather than AUTO. Proceed with your examination of the duct work, looking for leaks and loose … 2 Step 2 – Loose Flex Connections. 3 Step 3 – Ripped Flex. 4 Step 4 – Wait and Test. 5 Step 5- Sealing Heat Ducts.
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