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The difference between class a laminar flow hood and class 100 laminar flow hood
The difference between class a laminar flow hood and class 100 laminar flow hoodDefinition and basic concepts(A) Class A laminar flow hood Class A laminar flow hood is a kind of air purification equipment that provides a local high cleanliness environment. It filters the air through a high-efficiency filter and sends it out in a laminar flow way to achieve a very high cleanliness standard in the operating area. It is usually used in key production or experimental links with the most stringent cleanliness requirements. (2) hundred-stage laminar flow hood The hundred-level laminar flow cover is also used for local air purification equipment, which can control the cleanliness of the working area at the hundred-level standard, that is, the number of particles ≥0.5μm per cubic foot of air does not exceed 100, providing a relatively clean space for related production or experimental activities. 2. Analysis of core differences (1) Cleanliness level Class A laminar flow cover: According to international standards, the cleanliness achieved by Class A laminar flow covers is equivalent to ISO 4.8 or higher, which is close to the theoretical highest level of cleanliness. In this environment, there are almost no dust particles and microorganisms, which can meet the requirements of cleanliness such as sterile drug filling, high-precision electronic chip manufacturing, and other processes. Hundred-level laminar flow covers: The cleanliness of hundred-level laminar flow covers is ISO 5, although it is also A high cleanliness level, compared to the A-level laminar flow covers, the number of dust particles allowed is relatively large. It is suitable for scenes that have high requirements for cleanliness but are not as strict as Class A, such as the production of ordinary electronic components and general biological experiments. (2) Airflow organization form Class A laminar flow cover: Generally adopts the form of vertical unidirectional flow air flow organization, the air is evenly sent vertically down from the top of the high-efficiency filter, and the dust particles are quickly taken away from the working area in the form of a piston flow, avoiding the turbulence and eddy current of the airflow, and ensuring the cleanliness of the entire working area is uniform. Hundred-stage laminar flow cover: it can adopt vertical unidirectional flow or horizontal unidirectional flow air organization form. Horizontal unidirectional hundred-stage laminar flow hood, air from one side of the HEPA filter is blown horizontally, through the work area from the other side of the discharge. Different forms of airflow organization have their advantages and disadvantages in practical applications, and the horizontal unidirectional flow may be slightly inferior in the uniformity of airflow coverage, but it has the convenience of installation and use in some specific workplaces. (3) Structural design and material Class A laminar flow cover: In terms of structural design, Class A laminar flow cover pays more attention to tightness and airflow uniformity. The shell is usually made of high-quality stainless steel, which is processed and welded carefully to ensure that there are no leakage points and prevent external pollutants from entering. The internal HEPA filter frame is also specially designed to fit closely with the housing, further improving the overall tightness. At the same time, to ensure the stability and uniformity of airflow, the selection and layout of key components such as fans and filters have been strictly calculated and tested. 100-stage laminar flow cover: the structural design is relatively simple, in addition to stainless steel, the material will also use some low-cost galvanized steel and other materials. Under the premise of ensuring the basic air purification function, the cost is appropriately reduced to meet the needs of more cost-sensitive users who need a certain degree of cleanliness. However, in the configuration and installation of high-efficiency filters, the 100-stage laminar flow hood still follows strict standards to ensure that it can meet the cleanliness requirements of the 100-level. (4) Performance parameters and operating costs Class A laminar flow hood: Due to its ultra-high cleanliness requirements and precision design, Class A laminar flow hoods are usually equipped with high-performance fans and high-quality filters, and the power of the fans is large to ensure that there is enough air volume and wind speed to maintain a stable laminar flow state. This also results in relatively high operating costs, not only in terms of energy consumption but also in the frequency and cost of replacing filters, as they need to be replaced more frequently to ensure that Class A cleanliness standards are always met. Hundred-stage laminar flow cover: The fan power is relatively small, and the operation energy consumption is low. The replacement cycle of the filter is relatively long, and the operating cost is lower than that of the A-class laminar flow hood, which has better economy while meeting the requirements of certain cleanliness. 3. Comparison of application scenarios (1) Application scenarios of Class A laminar flow hoods Aseptic drug production: In the key processes such as the filling and freeze-drying of aseptic drugs, the A-level laminar flow cover can provide the strictest aseptic protection for drugs, prevent microbes and dust particles from contaminating drugs, and ensure the quality and safety of drugs. High precision electronic manufacturing: such as the photolithography, etching, and other links in the chip manufacturing process, the environmental cleanliness requirements are extremely high, even small dust particles may lead to chip defects, affecting product performance. Class A laminar flow covers can provide a nearly perfect clean environment for these processes and effectively improve the yield of chips. (2) Application scenarios of 100-stage laminar flow hoods Production of ordinary electronic components: In the production of electrical components such as resistors, capacitors, and ordinary circuit boards, the hundred-level laminar flow hood can meet the requirements of the cleanliness of the production process, prevent dust and other pollutants from affecting the quality of the product, and will not bring high costs like the A-level laminar flow hood. Biological laboratory: When conducting general cell culture, microbial detection, and other experiments, the 100-stage laminar flow shield can provide a relatively clean operating environment to avoid interference from external microorganisms and dust on the experimental results. Fourth, how to choose the right laminar flow cover When faced with the choice of an A-stage laminar flow hood or a 100-stage laminar flow hood, it is necessary to consider many factors. If the production process or experiment requires very high cleanliness, such as involving high-active drug production, ultra-precision electronic manufacturing, etc., A laminar flow mask is the best choice, despite its high cost, but can ensure product quality and the accuracy of the experimental results. For ordinary electronic production, general biological experiments, and other scenes, the 100-stage laminar flow hood can meet the requirements of cleanliness, but also has a better economy, which is a more suitable choice. Although class A laminar flow hood and class 100 laminar flow hood belong to the laminar flow hood family, there are obvious differences in cleanliness, air flow organization, structural design, and application scenarios. Understanding these differences helps us make correct decisions according to actual needs, and provide a reliable clean environment for production and scientific research activities. |
