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The ventilation duct generally adopts three-stage filtration, namely ordinary filtration device, medium efficiency filtration device and high efficiency filtration device. The quality of the filter needs to be checked. The filter with poor quality takes a short time and the filtering effect is not good. In particular, the air resistance is too large, resulting in small air output. According to my investigation, the high-efficiency filter in the thousand grade purification room needs to be purchased in Shanghai. The reconnection part of the ventilation pipe shall use high-quality sealing rings. Use sealant to make up for the quality problem of the sealing ring. If it takes a little longer, there will be problems with the pipe sealing, which is very troublesome to solve. Will cause unexpected losses. If the quality of the air supply pipe goes wrong, it means that the whole project is torn down and restarted. Most of the problems in the quality of purification works are caused by problems in pipeline installation. Re applying sealant can only solve the problems temporarily. In some users, the high-efficiency filter is replaced frequently. Generally, there are problems in the air supply pipe, so the purification pipe must be installed carefully. The project supervisor cannot leave for a minute.
