Replacement of the pre-filter generally does not require a shutdown or other normal work schedule and arrangement. After the installation without debugging can guarantee the normal operation of air conditioning fresh air equipment. So experienced customers will focus on the pre-filter. Prefilters can use F8 filtration (95% colorimetric) for highly clean areas such as the 10,000-class and 100,000-grade cleanrooms and operating theaters. In this way, the end of the life of high efficiency filter can generally reach 5 years. In foreign projects and domestic new projects. The F8 filter is the most common pre-filter for non-uniform flow cleanrooms. For the clean room of chip factory 100, 10 or higher, the common efficiency level of prefilter is H10 (MPPS85%), and many new projects simply choose HEPA (filtration efficiency of 0.37 particles ≥ 99.97%). In the past, the domestic clean room air conditioning system design, filter common configuration: primary → efficiency → efficiency. At that time the end of the high efficiency filter life of only 1-3 years, the worst also a few months. Can be seen, the level of pre-filter efficiency determines the end filter life.
In this case,
Some occasions, the provisions of the use of high efficiency filter is not out of resistance considerations, but other factors, if the plant in hydrofluoric acid, and the workshop air conditioning is not a new air system, high efficiency filter glass fiber filter will be Back to the wind corrosion. For safety, high efficiency filters must be replaced regularly. At present, some domestic third-class hospitals and pharmaceutical plants, the annual rainy season will take the initiative to replace the high efficiency filter, the main purpose is to prevent the filter has any possible mold contamination. In some countries, third-class hospitals, pharmaceutical laboratories, and laboratories dealing with dangerous goods will use new high-efficiency filters to ensure safety and reliability before undertaking a new health issue.
