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.

　　另一个是要掌握通风管道污染检测的步骤:，在清洗空调通风系统风管表面积风量之前。在每个空调和通风系统的通风管道上选择少5个具有代表性的采样点(如新风、送风和回风风道)进行确定和测试;如果在主通风管道内无法采样，可以提取不少于5个采样点。在对主通风管道取样时，打开维护孔、清洗孔或现场孔。取样时将风口从送风口移开。采样时应将风管表面的灰尘全部收集起来，并在规定的区域内完好无损地取出风管。

　　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.

　　现在，随着城市的发展，越来越多的高层建筑出现在每个城市，尤其是在这个城市越来越多的高层建筑，我们走在街上，到处都可以看到高层建筑，而这些高层建筑大多都装有空调。事实上，这些高层建筑内的空气是通过通风管道输送的。随着人们对健康的追求和对空气质量的要求的提高，空调通风管道清洗的重要性将逐步提高。

　　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.

　　所以在清洗行业,对通风管道清洗行业,随着意识的提高,将有一个良好的发展,在未来5到10年也是一个发展高峰,但你也要看到由于建筑通风系统的复杂性,也很难清洗,所以企业和事业单位的需求有这样的顺序，在选择通风管道清洗企业的时候也要选择一些比较正规的店铺，这样才能达到以上的质量和效果。

　　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.