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Above-ground ducts can be made out of a variety of materials, including: plain steel; galvanized sheet metal; aluminum; typically installed outside of building copper;typically installed outside of building fiberglass; paper fiber; are installed in concrete. vitrified clay tile.are installed in concrete. Underground ducts are made of approved concrete, clay, metal or plastic.

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1. Above-ground ducts can be made out of a variety of materials, including: plain steel; galvanized sheet metal; aluminum; typically installed outside of building copper;typically installed outside of building fiberglass; paper fiber; are installed in concrete. vitrified clay tile.are installed in concrete. Underground ducts are made of approved concrete, clay, metal or plastic.





 
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