Dear Rob, Thank you for your response. I have looked the inspector's report. He went to the attic and checked two water heaters, chimmey, wind turbines and the electric attic fan, but not any vent(s). He even missed the kitchen ventilation. The air duck pipe hung on the inner roof. I just bought a new duct pipe long enough to get it connected to the outside. I will call the inspector tomorrow. In the mean time, I may check out the dryer vent, too. Thank you, TL