German
French
Italian
Portuguese
Japanese
Korrean
Russian
What are the differences between HEPA air filters?
What are the differences between HEPA air filters?First, the initial effect of air filter(1) Appearance and material The appearance of the initial effect air filter is usually simpler, and there are three common styles plate, folding, and bag. The frame materials are mainly moisture-proof cardboard, galvanized iron frame or aluminum frame, etc., among which the moisture-proof cardboard has low cost and is convenient for large-scale production applications; Galvanized iron frame with good robustness and durability; The aluminum frame is light and corrosion-resistant, making it easy to install and remove. In terms of filter materials, non-woven fabrics, nylon mesh, activated carbon filter materials, metal mesh, etc., these filter materials are relatively loose in texture, with chemical fibers and man-made fibers as the main components, and the folding design of the filter layer greatly increases the filtration area and improves the filtration efficiency. (2) Filtration accuracy The initial effect filter is mainly used to filter dust particles above 5μm, the filtration accuracy is at the G1-G4 level, common such as G3, and G4 levels, and has a good intercepting effect on large particles of dust, hair, catkins, and other suspended matter. Take the daily home scene, when the window is opened for ventilation, the dust, pollen, and other large particles of pollutants in the outdoor air will be mostly blocked out after the primary effect filter, so that the air entering the room will be obviously clean and reduce the dust accumulation phenomenon on the surface of the furniture. In the school classroom, the primary filter can effectively filter the chalk dust, creating a relatively clean air environment for teachers and students. (3) Application scenarios The initial effect air filter has a wide range of application scenarios because of its high-cost performance and ability to meet basic filtration needs. In the ventilation system of schools, homes, factories, offices, and other places, it often acts as the first line of defense and assumes the heavy responsibility of primary filtration, which can greatly reduce the working pressure of subsequent medium-efficiency and high-efficiency filters and extend their service life. Like a general office building, the front end of the central air conditioning system is configured with an initial effect filter, which can filter out the large particles in the air first, which not only protects the internal components of the air conditioner, but also delivers relatively clean air for the room, and the cost is more controllable, which is an economic and practical choice. Second, medium effect air filter (1) Structural characteristics The medium effect air filter has a unique place in the structure, the windward side is large, and the filter material is often made of special non-woven fabric or glass fiber made of a multi-bag or multi-layer structure, which makes it significantly increases the amount of air dust, can accommodate more dust impurities. Compared with the primary filter, its structure is more compact and precise, can adapt to the filtration needs of large air volume, and performs well in some large ventilation systems and centralized air supply systems, which can not only ensure the smooth circulation of air, but also effectively intercept the suspended matter in the air, laying a good foundation for subsequent fine filtration. (2) Filtration performance Medium effect filter is mainly used to filter 1 μm-5 μm dust particles, filtration efficiency level from F5-F9, common such as F8 level, the fine dust in the air, smoke, microorganisms, and other good capture ability, can greatly reduce the content of suspended matter in the air. It is worth mentioning that it also has the characteristics of high temperature and high humidity, the maximum use temperature can reach 80 ° C, and the humidity can reach 80%, which makes it favored in industries such as pharmaceutical, electronics, food, and other environmental requirements, and can work stably under complex temperature and humidity conditions to ensure the air quality of the production environment. (3) The role in the filtration system In the air filtration system, the medium effect filter plays a key role in connecting the preceding and the following. It is usually placed after the primary effect filter and before the high-efficiency filter, on the one hand, it can further filter the smaller particle pollutants missed by the primary effect filter and reduce the filtration burden of the high-efficiency filter; On the other hand, by blocking most of the dust, the service life of the high-efficiency filter is effectively extended, and the overall replacement cost is reduced. In some precision manufacturing workshops, the air needs to go through the initial effect, medium effect, high efficiency three filtrations, medium effect filter as an intermediate link, to ensure that the air entering the high-efficiency filter has been fully pre-treated, and finally provide the workshop with ultra-clean air to meet the strict requirements of the production process. Three, the HEPA air filter (1) Core filter material and design HEPA air filters can be called the "precision guard" in the field of air purification, and its core filter material is usually made of ultra-fine glass fiber filter paper, which is extremely thin and can weave an extremely fine filter structure and has a strong ability to capture tiny particles. The filter material is often designed with multiple folds, just like the bellows of an accordion, which greatly increases the filtration area in a limited space to ensure that the air can fully contact the filter material, thereby improving the filtration efficiency. Each fold is carefully designed to form a complex airflow channel when the air flows through, so that even the tiniest dust particles are difficult to escape, providing a solid guarantee for the ultra-clean air environment. (2) Filtering indicators The filtration accuracy of the HEPA filter is amazing, it can accurately capture small suspended matter below 0.5μm, and the atmospheric dust counting efficiency is as high as 99.99% for particles with particle size greater than 0.3μm, which can effectively remove extremely fine and harmful pollutants such as bacteria, viruses, smoke and chemical smoke in the air. To create nearly sterile, dust-free pure air for places with demanding air quality requirements. In terms of resistance, it optimizes the filter structure and airflow channel design to ensure ultra-high filtration efficiency while controlling the resistance at a low level, ensuring the smooth operation of the ventilation system and avoiding the soaring energy consumption caused by excessive resistance. Moreover, the high-efficiency filter also has the characteristics of large air volume and large dust capacity, which can operate stably for a long time, adapt to the needs of high-intensity air purification, and continue to protect air quality. (3) Fields of application Due to its excellent filtration performance, high-efficiency air filters are widely used in electronic optics, liquid crystal manufacturing, biopharmaceutical, precision instruments, medical health, aerospace, and other high-end fields. In the electronic chip manufacturing workshop, a tiny particle of dust may lead to the chip short-circuit scrap, the high-efficiency filter ensures the cleanliness of the air, to provide a foolproof environment for chip production; In biopharmaceutical laboratories, it can prevent external microorganisms from contaminating experimental samples and drugs to ensure the smooth development and production; In the operating room and intensive care unit of the hospital, high-efficiency filters are the key defense line to protect the health of patients, significantly reduce the risk of infection, create a safe and sterile space for medical treatment, and help the rapid development of modern science and technology and medicine. |
