Configuration of Filters in Clean Workshops
2025.02.20
In the construction of clean workshops, the rational configuration of filters is a crucial aspect to ensure that the workshop meets the corresponding cleanliness standards. Clean workshops of different cleanliness grades have strict requirements for the type, quantity, and performance of filters. As a professional constructor, Guangzhou Cleanroom Construction Co., Ltd., with its profound industry experience and professional expertise, precisely grasps the configuration standards of filters in clean workshops, creating clean production environments that meet the needs of various industries.
I. The Relationship between the Cleanliness Grade of Clean Workshops and Filters
The cleanliness grade of clean workshops is usually classified based on the number of dust particles with a particle size ≥ 0.5μm and ≥ 5μm per cubic meter of air. For example, the ISO 14644-1 standard divides the cleanliness into ISO 1 to ISO 9 grades. Different grades have significantly different requirements for the filtration efficiency of filters. Generally speaking, the higher the cleanliness grade, the higher the requirement for the filtration efficiency of the filters, and the more stringent the quantity and configuration of the required filters.
II. The Standard Requirements for Filters in Clean Workshops of Different Cleanliness Grades
ISO 5 Grade (Equivalent to Class 100) Clean Workshop
· Filter Type: High-efficiency particulate air (HEPA) filters must be used, which can achieve a filtration efficiency of over 99.97% for particles with a particle size ≥ 0.3μm. In some areas with extremely high cleanliness requirements, such as the photolithography workshop in electronic chip manufacturing, ultra-low penetration air (ULPA) filters may even be employed, which can achieve a filtration efficiency of over 99.999% for particles with a particle size ≥ 0.12μm.
· Quantity and Layout of Filters: Due to the extremely high cleanliness requirements of this grade of clean workshops, the filters need to be fully or nearly fully distributed on the ceiling. For instance, in an ISO 5 grade clean workshop with an area of 100 square meters, dozens or even hundreds of high-efficiency filters may be required to ensure that the air supplied to the workshop is almost free of dust particles. Medium-efficiency filters should also be installed at the air return outlets to prevent the filtered air from being re-contaminated during the circulation process.
ISO 7 Grade (Equivalent to Class 10,000) Clean Workshop
· Filter Type: The main filter is a high-efficiency particulate air filter, with a filtration efficiency of not less than 99.9% for particles with a particle size ≥ 0.3μm. Primary and medium-efficiency filters also need to be configured at the front end to form a three-stage filtration system. The primary-efficiency filter mainly filters large particles of dust, such as particles ≥ 5μm; the medium-efficiency filter further filters particles of medium particle size, such as particles ≥ 1μm.
· Quantity and Layout of Filters: The layout density of high-efficiency filters is relatively lower compared to that in ISO 5 grade clean workshops, but sufficient coverage still needs to be ensured. According to the area of the workshop and the design of the air flow organization, a high-efficiency filter may need to be installed for every 1 to 2 square meters. The primary-efficiency filters are generally installed at the fresh air inlet to initially filter the fresh air entering the workshop; the medium-efficiency filters are usually installed in the air conditioning unit to further purify the air that has passed through the primary-efficiency filtration.
ISO 8 Grade (Equivalent to Class 100,000) Clean Workshop
· Filter Type: A three-stage filtration system consisting of primary, medium, and high-efficiency filters is also adopted. The high-efficiency filter has a filtration efficiency of not less than 99.6% for particles with a particle size ≥ 0.3μm.
· Quantity and Layout of Filters: The installation quantity and density of high-efficiency filters are relatively lower than those in ISO 7 grade clean workshops. Depending on the actual situation of the workshop, a high-efficiency filter can be installed for every 2 to 3 square meters. The layout of the primary and medium-efficiency filters is similar to that in ISO 7 grade clean workshops, which are respectively responsible for the initial filtration of fresh air and the secondary filtration in the air conditioning unit.
III. Other Factors Affecting the Quantity of Filters
Workshop Area and Space Layout
The larger the area of the workshop, the greater the number of filters required to ensure the overall cleanliness. Meanwhile, a complex space layout, such as the presence of numerous partitions, corners, or different functional areas, may require more filters to optimize the air flow organization and ensure that every corner can meet the cleanliness standard. For example, in a large comprehensive electronic manufacturing clean workshop, different production process areas have different cleanliness requirements. It is necessary to reasonably adjust the quantity and layout of filters according to the spatial characteristics and functional needs of each area.
Production Process and Pollution Sources
The production process determines the situation of pollution sources in the workshop. If a large number of dust particles or harmful gases are generated during the production process, it is necessary to increase the number of filters or improve the performance of filters. For instance, in the clean production workshop of chemical products, certain chemical reactions may generate specific gaseous pollutants. In addition to the conventional air filters, filters with special adsorption functions also need to be configured, and the quantity should meet the treatment requirements of the pollutants.
Air Flow Organization Form
Different air flow organization forms, such as unidirectional flow, non-unidirectional flow (turbulent flow), or mixed flow, have different requirements for the configuration of filters. In a unidirectional flow clean workshop, since the air flows at a uniform speed and in a single direction, in order to ensure the cleanliness of the air flow throughout the process, the requirements for the quantity and density of filters are relatively high. In a non-unidirectional flow workshop, the air flow is relatively complex. Through the reasonable layout of filters and combined with a higher air change rate, the corresponding cleanliness standard can also be achieved, but the configuration method of filters is different from that in a unidirectional flow workshop.
IV. The Professional Advantages of Guangzhou Cleanroom Construction Co., Ltd. in the Configuration of Filters in Clean Workshops
Accurate Demand Assessment
The team of Guangzhou Cleanroom Construction Co., Ltd. will have in-depth communication with customers at the initial stage of the project, and comprehensively understand key information such as the production process, the use function of the workshop, and the expected cleanliness grade. Through the comprehensive analysis of these factors, the configuration requirements of filters are accurately evaluated. For example, when undertaking the project of a sterile drug production workshop for a pharmaceutical enterprise, the company will accurately calculate the type, quantity, and layout of filters required for each area according to the specific production process of the drug, such as the cleanliness requirements of different links such as raw material processing, preparation preparation, and filling.
Strict Product Selection
Guangzhou Cleanroom Construction Co., Ltd. has established long-term cooperative relationships with many high-quality filter suppliers and strictly screens filter products that meet the standards. When selecting high-efficiency filters, not only the filtration efficiency is considered, but also performance indicators such as the resistance, dust holding capacity, and service life of the filters are examined. For key projects, filter products of well-known brands that have passed strict testing and certification will be selected to ensure the reliability of the quality and performance of the filters.
Scientific Layout Design
The professional engineers of Guangzhou Cleanroom Construction Co., Ltd. conduct scientific layout design of filters according to the spatial structure, air flow organization form, and production process requirements of the workshop. Professional air flow simulation software is used to simulate and analyze different filter layout schemes, and optimize the installation position and quantity of filters to ensure that the air flow in the workshop is uniform and the cleanliness distribution is reasonable. For example, when designing the clean room for electronic chip packaging, the optimal installation angle and spacing of high-efficiency filters are determined through simulation analysis, so that the clean air can evenly cover the entire production area and effectively improve the cleanliness.
Comprehensive After-sales Service
After the completion of the clean workshop, Guangzhou Cleanroom Construction Co., Ltd. provides customers with comprehensive after-sales service, including the regular maintenance of filters and replacement guidance. A detailed filter maintenance plan is formulated, and customers are visited regularly to check the operation status of the filters, and potential problems are discovered and solved in a timely manner. At the same time, technical support and training for filter replacement are provided to customers to ensure that customers can correctly replace the filters and maintain the cleanliness of the workshop.
The configuration of filters in clean workshops is a complex and crucial link, involving many factors such as the cleanliness grade, the characteristics of the workshop, and the production process. With professional technology and services, Guangzhou Cleanroom Construction Co., Ltd. strictly follows the standard requirements of clean workshops, carefully configures filters for customers, and creates a safe, efficient, and standard-compliant clean production environment.
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