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If your home was built before 1970, you may have asbestos in your insulation. Before starting a first-time do it yourself duct cleaning project, take a good look your ventilation system. Open all access ports and doors to see if there is any stray insulation in your air duct system. How do you recognize asbestos? It was used in "blanket" insulation primarily in houses built between 1930 and 1950, and may resemble any other type of insulation you've seen. A good rule of thumb? Any insulation installed prior to 1970 should be considered contaminated with asbestos. If you find some before cleaning ducts, call a professional immediately and do not proceed with your home duct cleaning. Let the pros handle it. They will test the material and let you know exactly what you are dealing with.