After filtrating the air inhalation of the indoor air inhalation through the air filter at the top of the dust-free workshop, the clean air is sent in a uniform wind speed, so that the clean and sterile purification effect is achieved.

In the pharmaceutical industry, high -efficiency filters (HEPA) are used for the processing and filter of the processing and filtering of space air. Sterile production requires compulsory use of high -efficiency filters, and the production of solid and semi -solid dosage forms is sometimes used. H13 to H14 (DIN1822) is two types of high -efficiency filters, with an interception rate of 99.995%. But how long does it take to change?

The air filter is the core equipment of the air -conditioning purification system. The filter forms resistance to the air. As the filter accumulates the dust, the filter resistance will increase with. When the filter has too many dust accumulation and the resistance is too high, the filter will be reduced through the air volume, or the filter is penetrated. Therefore, when the resistance of the filter increases to a certain specified value, the filter will be scrapped. Therefore, the use of filters must master the appropriate use cycle. When the filter is not damaged, the service life is generally determined by resistance.

The diffusion effect of small -particle size dust (Brown movement) is obvious, the wind speed is low, and the airflow has a long time to stay in the filter material, and there will be more opportunities to impact obstacles in the dust, so the filtration efficiency is high. Experience shows that for high -efficiency filters, the wind speed is reduced by half, the passing rate of dust will be reduced by nearly one magnitude (an increase in efficiency value by one 9), the wind speed increases double, and the pass rate will be increased by one magnitude (the efficiency is reduced by one 9).

The air filter is a device that captures the particles through the action of porous filtration materials and enables the gas to purify. After air purification treatment, it is sent to the room to ensure the process requirements of the clean room and the air cleanliness in the general air -conditioned room.