I’ll start by saying that our home is new construction and we’ve lived here three years. This has been the same since we moved in after the build was finished. Airflow on the main floor is excellent but the upper floors the airflow is weak. We change the furnace filter monthly and the air vents are fully open. You can feel the air flowing but it’s not nearly as strong as the main floor. What would cause this? Especially considering is been this way since we moved in.
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