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　　First of all, we can see the cleanliness test process of ventilation duct after cleaning. First, we should clean the surface dust volume of ventilation duct of central air-conditioning ventilation system. These samples should be cleaned within seven days after cleaning the ventilation duct. After cleaning, the main air ducts such as supply duct, return duct and fresh duct of each set of central air conditioning ventilation duct are determined, and at least five representative sampling points are selected. The sample material is dried in a 105C thermostat for 2 hours, then cooled in a dryer for 4 hours, or stored in a dryer for 24 hours. The initial weight was measured with a balance in a sealed bag. Determine the sampling area of the sampling position of the ventilation duct and remove all residual dust on the wall of the inner duct.

　　另一個是要掌握通風管道污染檢測的步驟:首先，在清洗中央空調通風系統風管表面積風量之前。在每個中央空調和通風系統的通風管道上選擇至少5個具有代表性的采樣點(如新風、送風和回風風道)進行確定和測試;如果在主通風管道內無法采樣，可以提取不少于5個采樣點。在對主通風管道取樣時，打開維護孔、清洗孔或現場孔。取樣時將風口從送風口移開。采樣時應將風管表面的灰塵全部收集起來，并在規定的區域內完好無損地取出風管。

　　Another is to grasp the steps of ventilation pipe pollution detection: first, before cleaning the surface area of air duct of central air conditioning ventilation system. At least five representative sampling points (such as fresh air, supply air and return air duct) are selected for determination and testing in the ventilation ducts of each central air conditioning and ventilation system. If sampling is not possible in the main ventilation duct, no less than five sampling points can be extracted. When sampling the main ventilation pipe, open the maintenance hole, cleaning hole or site hole. Remove the tuyere from the supply tuyere when sampling. The dust on the surface of the air duct should be collected when sampling, and the air duct should be removed intact in the prescribed area.

　　現在，隨著城市的發展，越來越多的高層建筑出現在每個城市，尤其是在這個城市越來越多的高層建筑，我們走在街上，到處都可以看到高層建筑，而這些高層建筑大多都裝有空調。事實上，這些高層建筑內的空氣是通過通風管道輸送的。隨著人們對健康的追求和對空氣質量的要求的提高，空調通風管道清洗的重要性將逐步提高。

　　Now, with the development of the city, more and more high-rise buildings appear in every city, especially in this city, more and more high-rise buildings, we can see high-rise buildings everywhere on the street, and most of these high-rise buildings are equipped with air conditioning. In fact, the air in these high-rise buildings is transported through ventilation ducts. With people's pursuit of health and the improvement of air quality requirements, the importance of air conditioning ventilation duct cleaning will gradually increase.

　　所以在清洗行業,對通風管道清洗行業,隨著意識的提高,將有一個良好的發展,在未來5到10年也是一個發展高峰,但你也要看到由于建筑通風系統的復雜性,也很難清洗,所以企業和事業單位的需求有這樣的順序，在選擇通風管道清洗企業的時候也要選擇一些比較正規的店鋪，這樣才能達到以上的質量和效果。

　　So in the cleaning industry, the ventilation duct cleaning industry, with the improvement of awareness, will have a good development, in the next five to 10 years is also a development peak, but you also have to see that because of the complexity of the building ventilation system, it is difficult to clean, so the needs of enterprises and institutions have this order, in the selection of ventilation duct cleaning. Enterprises should also choose some more formal shops, so as to achieve the above quality and effect.