Spiral duct/ductwork/air duct/vent duct

--The advantages of Spiral ducts/ventduct/air ductcompared to traditional rectangular duct are numerous and compelling: -Fine appearance;-Economical to install;- Low air leakage, optimal airflow characteristics, and less pressure drop allow smaller and more efficient air moving equipment ;-Inherently stronger, allowing the use of lighter gauge, less costly metals ;-Efficiently manufactured from strip steel to any diameter ;-Spiral duct's smooth interior traps less dust and is easier to clean.We have pre-insulated spiral duct and un-insulated duct. Our products will satisfy every customer's requirement. Located in Dalian,it takes 2 hours by airplane from Beijing(Shanghai) to Our factory. You visit is welcomed.