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      Step-by-Step duct cleaning
      1. Remove the screws from air duct covers and return-air grill plates.
      2. Cover up your supply vents (those vents that supply heat or air to the rooms) with paper towels. …
      3. Set your thermostat to the “fan on” position. …
      4. Loosen dust in ducts. …
      5. Clean supply registers. …
      6. Clean the return registers.
      Answered by KopernikasGreen on January 23, 2021..