Ventilation duct is a municipal infrastructure for air circulation and reducing the concentration of harmful gases. It is widely used in restaurants, hotels, industry and agriculture. In life, we can see ventilation ducts everywhere, and the importance of ventilation ducts is self-evident. Due to the high manufacturing cost of ventilation pipe, the maintenance and treatment of pipe has been paid more and more attention. It is necessary to add "insurance" to the process of manufacturing, installation and use of ventilation pipe - do a good job in anti-corrosion and thermal insulation.

保溫和保冷：

Insulation and cold insulation:

冬天（保熱）：防止管道內空氣的熱損失；防止在輸送廢熱蒸汽或高溫氣體時，熱量散發到空間內而室內溫度升高；防止人接觸風道被燙傷；

Winter (heat preservation): prevent heat loss of air in the pipeline; Prevent the heat from being radiated into the space and the indoor temperature from rising when transporting waste heat steam or high-temperature gas; Prevent people from being scalded when contacting the air duct;

夏天（保冷）：可能出現因為輸送氣體的溫度低于周圍環境的溫度，管道外壁會產生結露現象，這對集中空調系統的風道會加大冷量損失，同時凝結水滴會污染吊頂和墻面，所以要做好保冷隔熱處理。

Summer (cold insulation): condensation may occur on the outer wall of the pipeline because the temperature of the transmitted gas is lower than that of the surrounding environment, which will increase the cooling loss of the air duct of the central air conditioning system, and condensate droplets will pollute the ceiling and wall, so cold insulation treatment shall be done well.

另外，當風道輸送氣體時，對風道進行除銹、刷防銹漆處理，對含塵氣體可噴涂防損保護層。當周圍環境空氣濕度較大時，風道外壁需做防腐蝕、防銹處理。只有進行防腐保溫（保冷），才能在之后的使用過程中減少腐蝕的現象。

In addition, when the air duct conveys gas, the air duct shall be derusted and painted with antirust paint, and the dust containing gas can be sprayed with anti-loss protective layer. When the ambient air humidity is high, the outer wall of the air duct needs anti-corrosion and anti rust treatment. Only by anti-corrosion and thermal insulation (cold insulation), can the phenomenon of corrosion be reduced in the later use process.

如：在雨季施工的過程之中要控制環境的溫度，要使用溫度計進行檢測，如果空氣施工超標，那么在這種四氟噴涂材料之中應該加入催干劑，以防泛白的情況發生，這些都是在施工過程中需要注意問題，對人員的操作的一個風干的過程之中，一定要嚴格控制溫度以及濕度。

For example, during the construction in rainy season, the temperature of the environment should be controlled and the thermometer should be used for detection. If the air construction exceeds the standard, the drying agent should be added to the tetrafluoro spraying material to prevent whitening. These are problems that need to be paid attention to in the construction process, which is an air drying process for the operation of professionals, Temperature and humidity must be strictly controlled.

俗語常說“里三層外三層”，其實這并不是一句玩笑話！噴涂防腐工藝的確需要面漆6次，才能做到防腐！

As the saying goes, "three floors inside and three floors outside", in fact, this is not a joke! Spraying anti-corrosion process really needs 6 times of finish paint to achieve anti-corrosion!

綜上所述，只有進行防腐保溫保冷，才能在之后的使用過程中減少腐蝕的現象。

To sum up, corrosion can be reduced in the subsequent use only by anti-corrosion, thermal insulation and cold insulation.

而如何減少腐蝕？那就得選對技術選對產品！

And how to reduce corrosion? Then you have to choose the right technology and the right products!

特氟龍（聚四氟乙烯，簡寫PTFE）害、不粘性、高潤滑（摩擦系數僅為0.04）、耐氣候、耐腐蝕（能耐水和一切有機溶劑）、耐低溫和耐高溫，這些都只是特氟龍的一些基本使用性能。

Teflon (polytetrafluoroethylene, abbreviated as PTFE) is non-toxic, non viscous, high lubrication (friction coefficient is only 0.04), weather resistant, corrosion resistant (aqua regia and all organic solvents), low temperature resistant and high temperature resistant. These are just some basic service properties of Teflon.