1. The surface of the ventilation duct is coated with a thin layer of zinc, which is immersed in a molten zinc bath. At present, the main production method is continuous galvanizing, which involves immersing the coils in a molten zinc plating bath to make galvanized sheet air ducts;

2、合金化鍍鋅風管。這種也是用熱浸法制造，但在出槽后，立即把它加熱到500℃左右，使其生成鋅和鐵的合金被膜。這種鍍鋅板具有良好的涂料的密著性和焊接性；

2. Alloyed galvanized air duct. This type is also manufactured using the hot dip method, but immediately after leaving the tank, it is heated to around 500 ℃ to form an alloy coating of zinc and iron. This galvanized sheet has good coating adhesion and weldability;

3、電鍍鋅板風管。用電鍍法制造這種鍍鋅具有良好的加工性，但鍍層較薄，耐腐蝕性不如熱浸法鍍鋅板；

3. Galvanized sheet air duct. The use of electroplating method to manufacture this type of zinc plating has good processability, but the coating is thinner and the corrosion resistance is not as good as that of hot-dip galvanized sheet;

4、單面鍍和雙面差鍍鋅風管。單面鍍鋅板風管，即只在一面鍍鋅的產品。在焊接、涂裝、防銹處理、加工等方面，具有比雙面鍍鋅板風管好的適應性。為克服單面未涂鋅的缺點，又有一種在另面涂以薄層鋅的鍍鋅板，即雙面差鍍鋅板；鍍鋅風管

4. Single sided and double sided galvanized air ducts. Single sided galvanized sheet air duct, which refers to products that are only galvanized on one side. In terms of welding, painting, rust prevention treatment, processing, etc., it has better adaptability than double-sided galvanized sheet air ducts. To overcome the disadvantage of not coating zinc on one side, there is another type of galvanized sheet coated with a thin layer of zinc on the other side, namely double-sided differential galvanized sheet; Galvanized air duct

5、合金、復合鍍鋅風管，它是用鋅和其他金屬如鉛、鋅制成合金乃復合鍍成的風管。這種鍍鋅風管既具有的防銹性能，又有良好的涂裝性能。

5. Alloy and composite galvanized air duct, which is made of zinc and other metals such as lead and zinc, and even composite plated air duct. This type of galvanized air duct has both rust prevention performance and good coating performance.

（一）防火風管的本體、框架與牢固質料、密封墊料必須為不燃質料，其耐火等級應切合計劃的劃定。

（1） The body, frame, and solid materials, as well as sealing gasket materials of the fire resistant air duct must be non combustible materials, and their fire resistance rating should be in accordance with the plan.

（二）鍍鋅或彩色涂層的拼接，應接納咬接或鉚接，且不得有十字型拼接縫。彩色涂層的塗塑面應設在風管內側，加工時應克制破壞涂塑層，破壞的部門應舉行修補。

（2） The splicing of galvanized or colored coatings should accept biting or riveting, and there should be no cross shaped splicing joints. The plastic coating surface of the color coating should be located on the inner side of the air duct. During processing, damage to the plastic coating layer should be restrained, and the damaged department should be repaired.

（三）焊接風管可接納搭接、角接和對接三種情勢，風管焊接前應除銹、除油。焊縫應融合良好、平整，外貌不應有裂紋、焊瘤、穿透的夾渣友好孔等缺陷，焊后的板材變形應改正，焊渣及飛濺物應打掃干凈。

（3） Welding of air ducts can accept three types of situations: overlap, corner joint, and butt joint. Before welding of air ducts, rust and oil should be removed. The welding seam should be well fused and flat, and there should be no defects such as cracks, overlap, penetrating slag friendly holes in the appearance. The deformation of the welded plate should be corrected, and the welding slag and splashes should be cleaned up.

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