Us duct’s clamp together duct, also called rolled-lip duct, has distinct advantages over traditional ductwork. features: speed and ease of installation available in light to heavy gauges adjustability via the 11″ sleeve (also called a nipple) adjustability in most fittings stainless steel and galvanized steel easy to ship and assemble with modular, standardized lengths easy to reuse, relocate, and clean these advantages fall mainly in the category of speed. The clamp together connections allow for an estimated 70% faster installation than traditional methods. However, this speed’s main reason isn’t just the clamping connections; it is the ease and flexibility of utilizing the adjustable sleeve. Precision cutting is not required.