Product review (5 stars): Great duct!
I needed flexibility as well as rigidity for a vertical roof venting installation, and this duct hose has it all. It forms easy enough, but holds it's circular shape very well even in tight bends. Considering the useful range of applications, the amount supplied comes in at a very good price. I'll use it in the future, for projects I only want to do once! The inside is quite smooth which will aid in any future cleaning needed, as well.