How to Test a Duct

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    • 1). Place the back of your hand under the duct. Little to no airflow from the duct indicates the duct is blocked with dust and debris. Use a vacuum cleaner with crevice attachment to remove dust from the duct.

    • 2). Verify balanced airflow from each duct. Close the ducts in rooms that appear cooler than others. Wait 10 minutes before reopening the ducts. Closing the ducts temporarily helps to balance the temperature range in each room of the home to prevent one room from appearing cooler than another.

    • 3). Look for condensation on vents in each room. Condensation indicates that the duct might need to be insulated to prevent mold and mildew damage. Consider adding a dehumidifier to remove excessive humidity from the home and reduce duct condensation.

    • 4). Inspect the air conditioning filter. Filters accumulate dust during normal operation of the air conditioning unit. Prevent excessive dust buildup in the air return and in each vent in the home by replacing the filter once every 30 days.

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