Ventilation duct information: Thin steel sheet, plywood, fiberboard, brick and concrete can be used as air duct information. Thin steel sheet is the most commonly used material. It is divided into ordinary steel sheet and galvanized steel sheet. Steel sheet with thickness of 0.5-1.5mm is used in general ventilation and air conditioning system. PVC board can also be used as air duct data. It is bright, dust-free and corrosion-resistant. It is sometimes used in air-conditioning projects. But the cost of construction and installation is high. In recent years, there is also the use of exterior disposal of glass fibreboard wind pipe data, it has both noise and thermal insulation effect.

　　1、薄鋼板風管。用薄鋼板制造通風管道，以采用低碳鋼板為宜，以冷軋鋼板適用于通風與空調工程。

　　1. Sheet steel air duct. It is advisable to use low carbon steel sheet to make ventilation pipes with thin steel sheet, and cold rolled steel sheet is most suitable for ventilation and air conditioning engineering.

　　厚度在1．2mm以內的薄鋼板風管采用咬口銜接，厚度2mm以內時采用焊接。依據有關規則，薄鋼板風管與鍍鋅鋼板風管，當矩形風管邊長≥630mm和保溫風管邊長≥800mm，其管段長度在1．2mm以上的均應采取加固措施。普通運用角鋼加固風管，邊有采用起高接頭（立咬口〕或在風管管壁上滾槽壓出凸棱等加固辦法。風管與風管銜接普通采用角鋼或扁鋼法蘭。

　　The thin steel plate air duct with thickness less than 1.2mm is joined by bite and welded with thickness less than 2mm. According to the relevant rules, when the side length of rectangular air duct is greater than 630 mm and the side length of insulating air duct is longer than 800 mm, the reinforcing measures should be taken for both thin steel air duct and galvanized steel air duct. Angle steel is usually used to reinforce air duct, and some reinforcement methods, such as lifting joint (vertical bite) or rolling groove on the wall of air duct, are used to reinforce the air duct. Angle steel or flat steel flange is usually used to connect air duct with air duct.

　　2、鍍鋅鋼板風管。鍍鋅鋼板施工時應留意使鍍鋅層不受毀壞，應采用咬口和鉚接。

　　2. Galvanized steel air duct. During the construction of galvanized steel sheet, attention should be paid to keeping the galvanized layer from being destroyed, and bite and riveting should be adopted.

　　3、不銹鋼板風管。在加工時應避免板材外表產生劃痕刮傷和凹陷等缺陷，且不得用鐵錘敲打，防止毀壞合金元素的晶體構造，否則被鐵錘敲擊處會呈現腐蝕中心。不銹鋼的強度較高、彈性好，當管壁厚度大于0．8mm時，普通采用焊接，厚度在0．8mm以下時，采用咬口銜接。不銹鋼風管銜接運用的法蘭，普通是把不銹鋼板剪成條形，矩形法蘭可按尺寸采用焊接，圓形法蘭則采用冷彎法加工。

　　3. Stainless steel plate air duct. In processing, scratches, scratches and depressions on the surface of the sheet should be avoided, and hammers should not be used to knock, so as to prevent the destruction of the crystal structure of alloy elements, otherwise there will be corrosion centers where hammers strike. Stainless steel has high strength and good elasticity. When the thickness of pipe wall is more than 0.8mm, welding is usually used. When the thickness is less than 0.8mm, bite joint is used. The flanges used for connecting stainless steel air ducts are usually cut into strips, rectangular flanges can be welded according to size, and circular flanges are processed by cold bending method.

　　4、鋁板風管。在摩擦時不會產生火花，故常用于防爆通風系統。

　　4. Aluminum plate air duct. Sparks do not occur when friction occurs, so they are often used in explosion-proof ventilation systems.

　　風管的咬口成型應盡量采用木錘或木方尺。為防止咬口縫變形，好運用機械成型。當鋁板厚度大于1．5mm時，可采用氣焊或氮弧焊接。

　　The bite moulding of air duct should adopt wooden hammer or square ruler as far as possible. In order to prevent the deformation of bite joint, it is better to use mechanical forming. When the thickness of aluminium sheet is more than 1.5mm, gas welding or nitrogen arc welding can be used.

　　鋁及鋁合金與鐵、銅等金屬接觸時會產生電化學腐蝕，因而，鋁板風管應盡量采用鋁制法蘭；若用普通角鋼法蘭時，應鍍鋅或做防腐絕緣處置，鉚接時應采用鋁鉚釘。

　　Aluminum and aluminium alloys will produce electrochemical corrosion when they contact with iron and copper. Therefore, aluminium flange should be used as far as possible in air duct of aluminium plate. If common angle steel flange is used, zinc plating or anti-corrosion insulation treatment should be done, and aluminium rivet should be used in riveting.

　　5、復合鋼板風管。常用于防塵請求較高的空調系統和-10℃－70℃溫度下耐腐蝕系統的風管。這種風管在加工時留意不要毀壞塑料層，它的銜接辦法只能是咬口和鉚接。

　　5. Composite steel plate air duct. It is often used in air conditioning systems with high dust-proof requirements and air ducts of corrosion-resistant systems at temperatures ranging from - 10 C to 70 C. This kind of air duct should be careful not to destroy the plastic layer during processing, and its connecting method can only be biting and riveting.

　　6、硬聚氯乙烯塑料板風管。硬聚氯乙烯塑料具有良好的化學穩定性，對各種酸類、堿類、鹽類的作用都穩定，但對強氧化劑和濃硝酸、發煙硫酸和芳香族碳氫化合物與氯化碳氫化合物是不穩定的。

　　6. Air duct of rigid PVC plastic sheet. Hard polyvinyl chloride plastics have good chemical stability, which is stable to various acids, bases and salts, but unstable to strong oxidants and concentrated nitric acid, fuming sulfuric acid, aromatic hydrocarbons and chlorinated hydrocarbons.