
Specially manufactured metal duct, on the other hand, is quite expensive. Metal duct is also generally more difficult to cut and assemble. FLEXIBLE HOSE Flexible rubber hose, polyethylene, plastic flex- hose and other flexible ribbed hose is generally used for short runs, small shops and at rigid ductto- tool connections. There are many different types of flex hose on the market today. These are manufactured from materials such as polyethylene, PVC, cloth hose dipped in rubber and even metal, in