I don't believe that aluminium is bad, because aluminium can't be gas and contact with lung.
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Notso_Ken:All I've EVER seen for ductwork is aluminum. They sure don't make it from steel! Too heavy, not easy enough to work with.
Ken
bradxb:Ingestion of aluminum has been linked, in some studies, with neurodegenerative disorders such as Alzheimer's Disease. There is no conclusive evidence at this point.
I've seen/worked with both.RV:Ive only seen duct work made from tin