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OK, I am really confused. My consulting mechanical engineer came by to look at my new boiler. WHile he was there he noticed that the acoustical material lining my a/c ducts had loose fibers showing (I think they are fiberglass). He told me it was a health issue to have the fibers at the ends of the ducts exposed, and that the air from the vents could carry them out in the room. According to him, they should have some kind of capping on them. I called my a/c guy and he said that was ridiculous. Has anyone come across this issue before? I would appreciate any input.

Thanks