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(nèi)空氣的熱損失；防止在輸送廢熱蒸汽或高溫氣體時(shí)，熱量散發(fā)到空間內(nèi)而室內(nèi)溫度升高；防止人接觸風(fēng)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(xiàn)因?yàn)檩斔蜌怏w的溫度低于周?chē)h(huán)境的溫度，管道外壁會(huì)產(chǎn)生結(jié)露現(xiàn)象，這對(duì)集中空調(diào)系統(tǒng)的風(fēng)道會(huì)加大冷量損失，同時(shí)凝結(jié)水滴會(huì)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(dāng)風(fēng)道輸送氣體時(shí)，對(duì)風(fēng)道進(jìn)行除銹、刷防銹漆處理，對(duì)含塵氣體可噴涂防損保護(hù)層。當(dāng)周?chē)h(huán)境空氣濕度較大時(shí)，風(fēng)道外壁需做防腐蝕、防銹處理。只有進(jìn)行防腐保溫（保冷），才能在之后的使用過(guò)程中減少腐蝕的現(xiàn)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(guò)程之中要控制環(huán)境的溫度，要使用溫度計(jì)進(jìn)行檢測(cè)，如果空氣施工超標(biāo)，那么在這種四氟噴涂材料之中應(yīng)該加入催干劑，以防泛白的情況發(fā)生，這些都是在施工過(guò)程中需要注意問(wèn)題，對(duì)人員的操作的一個(gè)風(fēng)干的過(guò)程之中，一定要嚴(yán)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(yǔ)常說(shuō)“里三層外三層”，其實(shí)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(jìn)行防腐保溫保冷，才能在之后的使用過(guò)程中減少腐蝕的現(xiàn)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(duì)技術(shù)選對(duì)產(chǎn)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(jiǎn)寫(xiě)PTFE）害、不粘性、高潤(rùn)滑（摩擦系數(shù)僅為0.04）、耐氣候、耐腐蝕（能耐水和一切有機(jī)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.