I performed an inspection on a home that was built in 1999 and was in very good shape and well maintained. I found very little to report on this home and was stumped in regards to the black almost oily film on the interior walls, ceilings, fixtures, vents and edges of the carpet. Upon discussion with the owners, the Mrs. claimed that she has been diagnosed with “Chronic fatigue Syndrome”…whatever that is. I have not a clue what may cause something like that and I explained to them that the indoor air quality should be further tested to try to determine if indeed there were anything that is in the indoor air that may be harmful to her well being. I am not a Industrial Hygienist and I acknowledged that I am only certified to test for mold, wether it is visible or airborne. Anyhow, film was not in the garage and I was saying to myself that it must be coming from the forced air furnace…upon a diligent inspection I could not determine anything that might be coming from the furnace. Maintenance was done annually and the blower had been replaced within the past year. I really don’t know what this could be and I feel badly for the Mrs. and would really like to help her…but, I am not sure how. I did take some air samples upon their request and I will get the results back tomorrow. Any feedback or insight would be greatly appreciated. The photos are darker than I would have liked, however, that is because she had all the windows completely covered and it was a clear and beautiful day in Michigan.