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If you notice lingering cooking odors in your building, weak air flow from central air vents, or excessive dirt around the vents, you most likely have an air circulation problem due to a dirty central air system. This isn't just a problem found at home; one of the symptoms of sick building syndrome--a problem in office buildings and elsewhere--is poor air flow in those buildings. Whether at home or the office, if you notice the symptoms of reduced air flow, chances are you will need a complete air duct cleaning.