The support principle of ventilation pipe installation and processing system: the pipe should not be directly supported on the equipment with the valve, and the support or hanger should be set separately. The welding position of the pipeline should be in the place where the construction is convenient or the stress is small, and the welding seam should not be located at the support and the distance should not be less than 200 mm.

不同含塵氣體性質不同，則凈化的分段處理應不同。通風管道加工系統布局中要保證整體系統的漏損小，確保吸塵口的有足夠的風量。通風管道加工系統布局要減小阻力。圓形風管強度大耗材少，但加工工藝復雜些，占用空間大；不銹鋼風管易布置，容易加工，因而使用較為普遍。山東通風管道加工還有系機械化生產由鋼帶螺旋繞制而成，有圓形、矩形，為節省空間，大量的不銹鋼風管做成扁圓形。

If the properties of different dust containing gases are different, the purification should be carried out in different stages. In the layout of the ventilation pipe processing system, the leakage of the whole system should be small, and there should be enough air volume at the dust suction port. The layout of ventilation pipe processing system should reduce resistance. The circular air duct has high strength and less consumables, but the processing technology is more complex and takes up more space; stainless steel air duct is easy to be arranged and processed, so it is widely used. Shandong ventilation pipe processing is also a mechanical production, which is made of spiral wound steel strip. There are round and rectangular. In order to save space, a large number of stainless steel air ducts are made into flat circles.

風管上按材質一般分為三類：鍍鋅不銹鋼風管、不銹鋼不銹鋼風管以及復合不銹鋼風管。其中，不銹鋼風管質量較好，適用性強，但高?，F在上較廣的不銹鋼風管是鍍鋅板的。鍍鋅板不銹鋼風管，基本是不銹鋼不銹鋼風管的特性，可是相對只要不銹鋼風管的三分之二乃更低。復合不銹鋼風管一般運用在外界環境較為一般，對風管要求不太高的場所。因為鐵皮容易在各種環境下發生化學反應，造成腐蝕、生銹。

Air duct shopping malls are generally divided into three categories: galvanized stainless steel duct, stainless steel stainless steel duct and composite stainless steel duct. Among them, stainless steel air duct has better quality, strong applicability, but high price. Now the more widely used stainless steel air duct in shopping malls is galvanized sheet. Galvanized stainless steel air duct is basically the characteristic of stainless steel air duct, but its price is two-thirds or even lower than that of stainless steel duct. The composite stainless steel air duct is generally used in the places where the external environment is more general and the requirements for air duct are not too high. Because the iron sheet is prone to chemical reactions in various environments, resulting in corrosion and rust.

山東通風管道加工而鋅在干燥的空氣中幾乎不發生變化。在潮濕的空氣中，鋅表面會生成細密的堿式碳酸鋅膜。不銹鋼風管主要是在風管鐵皮上鍍上一層鋅，對鐵皮起到保護的效果。鋅鍍層經鈍化處理、染色或涂覆護光劑后，能顯著進步其防護性和裝飾性。

However, zinc almost does not change in the dry air. In humid air, fine basic zinc carbonate film will be formed on the surface of zinc. The stainless steel air duct is mainly plated with a layer of zinc on the iron sheet of the air duct to protect the iron sheet. After passivation, dyeing or coating with light protecting agent, the protective and decorative properties of zinc coating can be significantly improved.

山東通風管道加工由保溫層雙面復合保護層制作而成，保溫層又要緊分為泡沫和玻璃棉兩大類。山東通風管道多見的風管板為鋁箔復合酚醛泡沫板、鋁箔復合聚氨酯泡沫板、鋁箔復合擠塑聚苯乙烯泡沫板、保溫玻璃棉風管板等。這類風管在運用性能上相對抱負，導熱系數小、輕質、易施工、潔凈等，當前曾經運用在許多大眾民用設備中，包含高層設備內。

Shandong ventilation pipe processing is made of double layer compound protective layer of insulation layer, and the insulation layer is divided into two categories: foam and glass wool. The duct panels commonly seen in Shandong ventilation ducts are aluminum foil composite phenolic foam board, aluminum foil composite polyurethane foam board, aluminum foil composite extruded polystyrene foam board, thermal insulation glass cotton air duct plate, etc. This kind of air duct is relatively ambitious in performance, with small thermal conductivity, light weight, easy construction, clean and so on. At present, it has been used in many civil equipment, including high-rise equipment.

(1)通風管道輸送空氣不產生噪聲，或兼有消聲功效;

(1) There is no noise in the air transported by ventilation pipe, or it has the effect of noise elimination;

(2)通風管道在容許承壓條件下，風管內空氣不會外泄漏或風管外空氣不會內侵入;

(2) Under the allowable pressure condition, the air inside the duct will not leak out or the air outside the duct will not invade inside;

(3)通風管道運用限期長和維護簡單。

(3) The operation period of ventilation pipe is long and the maintenance is simple.