How to Maintain the Cleanliness of a Cleanroom and Replace the Primary/ Medium-efficiency Filters?

Cleanrooms have high requirements for cleanliness, and air filters are used in cleanrooms. How can the cleanliness of a cleanroom be measured? How should a cleanroom be maintained? Let's discuss these points one by one.

Use of the cleanroom:

1. When entering the cleanroom, personnel should follow personal hygiene and work attire management requirements. They should wear appropriate work attire and enter the cleanroom following the purification procedures. Access to the clean areas should be restricted to authorized personnel only, and non-essential personnel should be prohibited from entering.

2. All tools and materials used in the cleanroom must undergo the specified purification procedures. Items brought into the cleanroom need to be processed and sterilized outside the clean area before entering.

3. The air conditioning system in cleanrooms with different cleanliness levels, such as Class 100 or Class 10,000, should operate continuously. For cleanrooms with intermittent operation, the air conditioning system should be operated during non-production hours according to technical requirements to maintain positive pressure inside the room.

Cleanroom monitoring:

1. Regular monitoring of the cleanroom is necessary to ensure the cleanliness of the environment. The monitoring parameters and frequency should comply with relevant regulations. Additional requirements can be specified if needed.

2. The medium-efficiency filters should be replaced under the following conditions:

(1) When the airflow velocity drops to a minimum level, and even replacing the pre-filters and medium-efficiency filters does not increase the airflow velocity.

(2) When the airflow through the high-efficiency filters is reduced to 70% of the original airflow.

(3) When there are irreparable leaks in the high-efficiency filters.

Cleanroom maintenance:

1. Establish a safety measures system in the cleanroom, including alarm systems, fire prevention measures, emergency lighting, etc. For cleanrooms where chemical substances or gases are used in the production process, appropriate safety measures should be taken based on the properties of corrosive, explosive, flammable, self-igniting, toxic, or other hazardous materials.

2. The maintenance of the cleanroom involves managing the air purification equipment and the personnel operating in the cleanroom. Appropriate management systems should be established to clearly define the methods and responsibilities of the management and ensure proper documentation.

3. In addition to regular management by personnel, a planned maintenance system should be established for the cleanroom. This includes periodic inspections and maintenance of the cleanroom's air conditioning system and air purification equipment.

To ensure the cleanliness of a cleanroom, regular monitoring is essential. Additionally, attention should be given to the usage and replacement of medium-efficiency filters to maintain high cleanliness levels and ensure smooth operation in the cleanroom.