Whether it is a soft wall, a hard wall, or a modular cleanroom, the cleanroom filters play an essential role in the cleanroom. Multiple filters filter out the number of particles required to meet cleanroom standards in conjunction with laminar airflow. So the cleanroom air purifier system is the key to keeping the cleanliness of the cleanroom.

Youthtech is a professional cleanroom supply manufacturer in China since 2005, and this post will share with you some knowledge about cleanroom filters.

The working principle of cleanroom filters

Laminar or unidirectional airflow is a way to ensure that air flows in only one direction, thereby reducing the possibility of particles getting kicked around and landing in your cleanroom. In most clean rooms, the air is directed from top to bottom, ensure pushing particles out, and there is no time to land where they shouldn’t. The laminar airflow pushes the air through the filter, thereby removing particles from the air entering your cleanroom.

Here, we will introduce three basic cleanroom filters and what do they do.

1. Pre-filters

Generally, these will remove larger particles before they enter the HEPA and ULPA filters. Using a pre-filter is also a good way to extend the life of the HEPA filter because it can reduce the workload of the HEPA filter. If your filtration system has a pre-filter, it is best to replace it six times a year or every other month. It will keep everything in your filtration system running smoothly and ensure that none of the cleanroom system components that pass the pre-filter experience excessive contamination.

2. ULPA filters 

The Ultra-Low Particulate Air filters function similarly to a HEPA filter but are more efficient. It can remove 99.99% of 0.128µm or larger particles. Since the function of ULPA filters is similar to HEPA filters, the maintenance and replacement procedures are roughly the same. The real difference is that ULPA filters are usually much more expensive than HEPA filters, so your maintenance plan is more important. Therefore, make sure to schedule regular maintenance and keep leak tests and leak repairs.

  1. HEPA filters

The Cleanroom HEPA filters can remove 99.99% of 0.3µm or larger particles. Perhaps the most popular option, if properly maintained and in the right environment, the life of these filters can last seven years. 

How often is the cleanroom HEPA filter replacement frequency? 

There is no fixed time for filter replacement. Instead, we recommend that you check your HEPA filter and identify signs that point to leaks or repair potential. Since each factor in the cleanroom will have a different effect on the filter, it is difficult to give a specific time frame for replacing the HEPA filter.

Temperature, humidity, and air pressure level all affect the life of the HEPA filter. Therefore, you must perform a leak test on the filter at least once every two years. If you find a serious leak, sometimes you can repair them, or you may need to replace the filter completely. The best way is to make sure your filter is properly maintained to ensure the longest life of the HEPA filter.

In Youthtech, our products including all types of cleanrooms, cleanroom air filters, purification equipment, cleanroom furniture, clean room panels.

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