Metal Ducts and pipe

Assortment of galvanized sheet metal vent pipe and vents. . Includes a couple of elbows. Great for projects or venting, dryer vent. Not recommended for Flue or chimney applications. Great for cat crawl or critter obstacles?? There's 25+ peices of piping @ 4ft in length. It's a mixed batch of 4 to 6in..most of the vents are 6in..best come have a look if interested. Ask any questions. Open to a fair offer. Ty.