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Choosing a cleanroom grade involves many determining factors, and each profession has a default standard. For example, in medical equipment packaging, the default level is ISO 7 (or 10000 level) cleanroom.

To confirm the required level for a specific cleanroom application, there are three primary issues:

1. What is my source of pollution?

2. How large particles do I need to filter out?

3. How much air do I need to remove pollutants?

1、 The Relationship between Pollution and Cleanroom Classification

A typical clean workshop aims to prevent pollutants from the external environment from entering. Once the cleanroom is built, the two things that cause pollution are people and the manufacturing process. Therefore, it is necessary for us to confirm what pollution has occurred among people and what pollution has occurred during the process.

Usually, people are able to establish lower levels of cleanrooms and maintain a cleaner environment by strengthening operations within the cleanroom. For example, providing workers with higher standards of protective clothing. Positioning the return air grille and filtration system in the optimal position within the cleanroom can make the area cleaner and maintain outstanding cleanliness in lower level cleanrooms. Understanding the sources of pollution and strengthening the planning of clean workshops, adopting methods that can compete with the sources of pollution, can save costs from the perspectives of construction and operation.

2、 How does particle size affect the level of cleanroom

One of the most important factors in determining which level of cleanroom to produce is the size of particles that need to be filtered out. What kind of particle is it? Is it a particle within a specific scale range? Many times, people will first check the cleanroom level, and then they will confirm their required cleanroom level based on the number of particles.

For example, some customers have less than 100 pollution particles per square foot in their workshops, and based on this information, they confirm that the level requirement is ISO 5 (or 100 level) clean workshop. However, if they do not consider the size of the particles they are trying to filter out, problems will arise. So when selecting the cleanroom grade, the particle size should also be considered.

3、 How does air circulation affect the cleanliness level of a cleanroom

Whenever the level drops to one level, such as from ISO 8 (100000 level) to ISO 7 (10000 level), it will require twice the amount of air for circulation. The cost of filtering and moving air is an important cost for operating a clean workshop, which includes the required number of filters, the required amount of return air space, the amount of air conditioning required for cooling return air, and so on.

A common mistake is that customers require a cleanroom that is too high, perhaps exceeding the cleanroom level they truly need. If you need a cleanroom with an 8-foot ceiling height, but in order to better align with the surrounding environment and make it 10 feet high, you need to set it higher, which will increase the volume of the area by 25%. Therefore, they increased the amount of air required for the clean room by 25%, and the cost of consumption also increased as a result. So Runde Purification advocates that the production of clean workshops should still be determined based on actual needs, and unnecessary other consumption should not be made.

In summary, it is advocated that when selecting a cleanroom grade, we should first seek professional companies to conduct on-site inspections before production.

Article source: Hunan Purification Engineering http://www.xwsk.com.cn/