Tubular Channel is a term used to describe a type of DUCT, which is a conduit or passage for air, gas, or liquid. It is typically made from metal, plastic, or fiberglass and is used in many different applications, such as ventilation systems, plumbing, and electrical wiring. Ducts are an important part of any building's infrastructure, as they provide a safe and efficient way to transport air, gas, and liquids.