The ducting is made from galvanized sheet metal. The duct is made up of a spiral pipe or material configuration. Ducts are conduits or passages used in heating, ventilation, and air conditioning (HVAC) to deliver and remove air. The needed airflows include for example, supply air, return air, and exhaust air. Ducts commonly also deliver ventilation air as part of the supply air. As such, air ducts are one method of ensuring acceptable indoor air quality as well as thermal comfort. A duct system is also called ductwork. Planning (laying out), sizing, optimizing, detailing, and finding the pressure losses through a duct system is called duct design. Specifications: MOC: Galvanized IronAvailable in 2 gauges, 22 gauges to 24 gauges Length as per clients requirements and preferences System resistance of 25mm to 2500mm WG static pressure