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Why are the fabric duct ventilation ducts used in HVAC spirals?

Why are the fabric duct ventilation ducts used in HVAC spirals? The following ventilation duct manufacturers will give you a detailed introduction: Spiral fabric duct ventilation duct means that the shape of the pipe is spiral, called spiral duct; the reason why HVAC pipes use spiral ducts is because The spiral fabric air duct ventilation pipe on the pipe wall can hinder the flow rate of the fluid in the pipe and better transfer energy. For example, there is hot water in the spiral air duct in winter, which can better transfer heat. Spiral fabric air duct ventilation duct Spiral seam thin-walled pipe, the early Swiss invention of the spiral air duct, it was first used in the military industry in Western countries, such as warships, ship row (supply) air systems, and later used in trains , subway, mines and other civil facilities. Spiral fabric duct ventilation duct was first used in some foreign and joint ventures. Since the spiral duct has a bone (spiral bite), the strength can be increased by 30%, so a thinner material can be selected. For example, a thickness of 0.8 mm can be changed to 0.6 mm. In addition, under the same cross-sectional area, the use of spiral ducts can save 20% of material. The spiral fabric air duct ventilation duct market is generally divided into 3 types according to the material: galvanized spiral duct, fabric air duct spiral duct and composite spiral duct. Among them, the quality of the fabric air duct is better, the applicability is strong, but the price is high. The most commonly used spiral pipes on the market today are galvanized sheets. Iron sheets are prone to chemical reactions in various environments, leading to corrosion and rust. Zinc hardly changes in dry air. In humid air, a dense alkaline zinc carbonate film is formed on the zinc surface. Spiral pipes are mainly galvanized on the pipe iron sheet to protect the iron sheet. The protective and decorative properties of zinc coatings can be significantly improved when passivated, dyed or coated with a gloss protector.

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