Can air ducts become contaminated with mold?

Yes. Air duct systems can become contaminated with mold.

Duct systems may be constructed of bare sheet metal, sheet metal with fibrous glass insulation on the exterior, or sheet metal with an internal fibrous glass liner, or they may be made entirely of fibrous glass. Bare sheet metal systems and sheet metal with exterior fibrous glass insulation can be cleaned and disinfected. If water damaged, ductwork made of sheet metal with an internal fibrous glass liner or
made entirely of fibrous glass will often need to be removed and discarded. Ductwork in difficult-to-reach locations
may have to be abandoned. If you have other questions, contact an air duct cleaning professional or licensed
contractor.

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