When should you change HEPA filter in cleanroom?

  • 27, 11, 2020

1. The pre-filter replacement

The pre-filter should be replaced every six months and should be checked regularly. The pre-filters in the changing rooms should be checked and replaced more often than usual, as people working in cleanrooms bring more dirt into the dressing room than they did when they put on their protective clothing into the cleanroom. If the pre-filters in the main cleanroom appear to be dirty for a period of fewer than six months, the inspection should be done every 2 to 3 months.

 Primary filter replacement

2. HEPA and ULPA filter replacement

As the HEPA filter blocks out a variety of particles, its ability to block airflow increases, forcing the blower to increase operating capacity to ensure sufficient airflow through the filter. The pressure loss on the filter has a significant impact on the entire cleanroom system. While it is not uncommon for HEPA filters to be installed in a cleanroom for medical device assembly to last 5 years or more, proactive early replacement prevents energy costs.

Hepa filter 2' x 2'Hepa filter 2' x 4' Hepa filter 2' x 4'

3. Filter efficiency optimization

Extending the service life of the filter reduces maintenance and overall costs. The longer filter life increases fan energy loss due to the filter clogging of particles. The extra energy cost of getting the air stream through a dirty filter is always higher than the cost of replacing the filter itself.

Using a filter to its ultimate endurance is rarely economically beneficial, not mention the increased likelihood of contamination associated with the reduced quality of the filter. Maximize filtration efficiency and investment by replacing dirty fan filters after pressure has halved from the initial setting.

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