My wife and son have been sick for the past four months with various illnesses ranging from bronchial, sinus, eye problems and pneumonia. I recently did a mold test. I tested the air flow out of a hvac system register and the results were positive for mold. My question is if it is possible to completley eliminate mold in duct work and if so, how to do it. I have talked to some people who have said the only way to eliminate it, is to replace the duct work. The duct work is metal.. Any help is appreciated since this as become a serious health issue.