A spiral tube is a type of tube that is shaped like a spiral or a helix. It is typically made of metal or plastic and is used in various applications such as ventilation, air conditioning, and heat exchangers.Spiral tubes are used in ventilation systems to distribute air throughout a building. They are also used in air conditioning systems to move air between the outdoor unit and the indoor unit. Spiral tubes can be made with various diameters and lengths to suit different applications.