First of all, we have to remind customers that to extend the service life of high-efficiency filters, Zui is simply a simple way to keep dust out of the pre-filter. That is to say, the airflow that is ensured by the high-efficiency filter is the air filtered through the pre-filter, the coarse filter, and the medium-efficiency filter. At this time, the air should reach 99.95% of the standard of less dust particles and lower pollution.
It should be noted here that the replacement of the pre-filter generally does not require the production to stop or stop other normal work plans and arrangements. After installation, the air conditioning fresh air equipment can be operated normally without debugging. So experienced customers will use their attention on the pre-filter. For highly clean areas such as Class 10,000 and Class 100000 cleanrooms and operating rooms, pre-filtration can be filtered with F8 (95% colorimetric method). In this way, the end-of-the-line filter can last up to 5 years. In foreign projects and new projects in China. The F8 filter is a common pre-filter for non-uniform flow clean rooms. For cleanrooms of the 100th, 10th or higher level of the chip factory, the common efficiency level of the pre-filter is H10 (MPPS 85%), and many new projects simply use HEPA (filtering efficiency of 0.37 particles ≥99.97%). In the past clean room air conditioning system design in the country, the common configuration of the filter is: primary → medium efficiency → efficient. At that time, the end-use high-efficiency filter had a service life of only 1-3 years, and the difference was a few months. It can be seen that the efficiency of the pre-filtration determines the end filter life.
In some cases, the regulations for the use of high-efficiency filters are not based on resistance considerations, but other factors. If there is hydrofluoric acid in the plant, and the workshop air conditioner is not a fresh air system, the glass fiber filter paper of the high-efficiency filter will be subject to Corrosion of return air. For safety, the HEPA filter must be replaced regularly. At present, some domestic third-class hospitals and pharmaceutical factories will actively replace high-efficiency filters after the rainy season, the main purpose is to prevent any possible mold contamination on the filter. In some national tertiary hospitals, biological laboratories in pharmaceutical factories, and laboratories dealing with dangerous goods, new high-efficiency filters are used to ensure safety and reliability before carrying out a new bio-problem.
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