Une hotte à flux laminaire est un dispositif de purification qui permet de créer un environnement de travail stérile et exempt de poussière. Sa fonction principale est de contrôler la poussière, les micro-organismes et autres contaminants dans la zone de travail à un niveau extrêmement bas grâce à un système de filtration de l'air (généralement combiné à des filtres à haute efficacité), tout en formant une barrière de flux d'air stable pour empêcher la contamination externe de pénétrer. Grâce à cette caractéristique, le système est largement utilisé dans de nombreux domaines où les exigences en matière de propreté de l'environnement sont strictes : I. Sciences de la vie et biomédecine Expériences microbiologiques : Elle est utilisée pour l'isolement, la culture et l'identification de bactéries, de champignons, de virus et d'autres micro-organismes, afin d'éviter que les échantillons expérimentaux ne soient contaminés par diverses bactéries présentes dans l'environnement, tout en protégeant les opérateurs contre l'exposition à des micro-organismes pathogènes (certaines hottes à flux laminaire de type biosécurité peuvent assurer une protection bidirectionnelle). Culture de cellules et de tissus : Dans la culture de cellules animales, la culture de tissus végétaux et la recherche sur les cellules souches, elle fournit un environnement stérile pour la croissance des cellules afin d'éviter toute contamination cellulaire susceptible d'entraîner l'échec de l'expérience. Expériences de biologie moléculaire : lors de l'amplification par PCR, du clonage de gènes, de l'extraction d'acide nucléique et d'autres opérations, il est nécessaire d'éviter la contamination de l'acide nucléique ou l'interférence de l'ADN exogène. Un flux laminaire

La résistance du filtre combiné à cadre plié est un indicateur important pour mesurer ses performances, car elle affecte directement la consommation d'énergie et l'efficacité opérationnelle du système de ventilation. Sa résistance (y compris la résistance initiale et la résistance finale) est principalement liée aux facteurs suivants : 1. Les caractéristiques du matériau filtrant lui-même Matériau et structure : La densité, le diamètre et la porosité des fibres des différents matériaux filtrants varient considérablement. Par exemple, les matériaux filtrants en fibres de verre superfines, en raison de leurs fibres fines et de leur faible porosité, ont une plus grande capacité à bloquer le flux d'air, et leur résistance est généralement plus élevée que celle des matériaux lâches tels que les tissus non tissés ou les filets en nylon. Si les fibres du matériau filtrant à structure plissée sont disposées de manière désordonnée, le chemin d'écoulement autour du flux d'air sera plus long et la résistance augmentera en conséquence. Épaisseur : Plus l'épaisseur du matériau filtrant est importante, plus la trajectoire du flux d'air est longue, plus la probabilité de collision et de friction avec les fibres est élevée, et la résistance augmente en conséquence. Par exemple, l'épaisseur du matériau filtrant des filtres à haute efficacité est généralement supérieure à celle des filtres primaires, et leur résistance initiale est également plus élevée. 2.

Le filtre combiné à cadre plié, avec sa grande surface de filtration et sa faible résistance, convient à de nombreux scénarios, notamment : les systèmes de ventilation et de climatisation pour les bâtiments civils. Dans les bureaux et les espaces commerciaux tels que les immeubles de bureaux, les centres commerciaux et les salles de réunion, les systèmes centraux de climatisation ou de ventilation utilisent souvent ces filtres comme pré-filtres. Ils retirent la poussière et les peluches, réduisant ainsi l'accumulation de poussière à l'intérieur du système, maintenant l'efficacité de l'équipement et assurant une bonne qualité de l'air intérieur. Installations médicales et de transport : Dans les grands espaces tels que les zones de traitement général des hôpitaux, les salles d'attente des aéroports et les salles d'attente des gares ferroviaires à grande vitesse, le filtre agit comme un filtre primaire ou à moyenne efficacité pour éliminer les particules en suspension dans l'air. Utilisé avec d'autres équipements de purification, il maintient la qualité de l'air et réduit les risques pour la santé. Processus de purification de l'air industriel En tant que dispositif de préfiltration : Dans les installations industrielles générales telles que la métallurgie, le pétrole, l'ingénierie chimique et la fabrication mécanique, les systèmes de ventilation centralisés ou les gros compresseurs d'air l'utilisent souvent comme dispositif de préfiltration pour intercepter d'abord les grosses particules de poussière et les impuretés, réduisant ainsi la charge sur l'équipement de filtration ultérieur et prolongeant la durée de vie des principaux composants de filtration. Purification générale de l'air : Il est utilisé pour la purification générale de l'air et la filtration intermédiaire dans l'air.

To determine whether a paper frame primary filter needs to be replaced, a comprehensive judgment should be made based on its filtration effect, operating status and appearance. The following are the specific judgment methods and standards: I. Judging through Resistance Changes (the most scientific method) The core function of the paper frame primary filter is to intercept particulate matter. As the accumulation of dust increases, the resistance of air passing through the filter material will gradually rise. When the resistance reaches a certain threshold, the filtration efficiency drops and the system energy consumption increases. At this point, replacement is necessary. Initial resistance: The resistance of a new filter (typically 5-15Pa, for specific details, please refer to the product parameter table). Final resistance: When the resistance reaches 2 to 3 times the initial resistance (for example, the initial resistance is 10Pa and the final resistance reaches 20 to 30Pa), it indicates that the filter material is severely clogged and needs to be replaced immediately. Operation method: Install differential pressure gauges before and after the filter, and record the resistance changes regularly. When the final resistance is reached, trigger the replacement. Ii. Judgment through Visual Observation (Intuitive Method) Regularly (it is recommended

Although the paper frame primary filter is a disposable filtration consumable and its service life cannot be infinitely extended, through reasonable use and maintenance methods, its replacement cycle can be appropriately extended without affecting the filtration effect. The specific methods are as follows: 1. Optimize the usage environment and reduce the dust load Control pollution sources If the filter is used in industrial workshops, warehouses and other places, it is necessary to minimize the generation of dust in the area (such as enclosing the material transportation process and regularly sprinkling water on the ground to reduce dust), reduce the concentration of particulate matter in the air from the source, and relieve the filtration pressure of the filter. Improve the ventilation path For the air inlets of air conditioning or ventilation systems, try to avoid areas with dense dust (such as construction sites or beside main roads), and install them in relatively clean directions to reduce the initial dust content inhaled. Second, adjust the system operation parameters reasonably Control the wind speed and air volume The filtration efficiency and dust-holding speed of the filter are closely related to the wind speed: when the wind speed is too high, dust is prone

The service life of paper frame primary filters is influenced by multiple factors and there is no fixed standard duration. It usually fluctuates between 1 and 6 months. The specific duration can be determined by considering the following key factors: I. Core Factors Affecting Service Life Environmental dust content This is the most significant influencing factor. In environments with high dust concentrations (such as near construction sites, textile workshops, and heavy industrial plant areas), filters will accumulate dust rapidly and may need to be replaced every 1 to 2 months. In environments with higher cleanliness levels (such as office buildings and hotels), the service life can be extended to 3 to 6 months. Air volume and wind speed The higher the filtration air velocity and the greater the ventilation volume, the higher the frequency and intensity of contact between the particulate matter in the air and the filter material, the faster the clogging speed of the filter material and the shorter its service life. Conversely, in systems with low air velocity and small air volume, the service life of the filter is relatively longer. Filter material quality and structure High-quality filter materials such as glass fiber and non-woven fabric have

Paper frame primary filters serve as the first stage in air filtration systems, removing larger particles (such as dust, hair, fibers, etc.) to protect downstream filters and equipment. They have extensive applications wherever basic air purification is required, including: HVAC (Heating, Ventilation and Air Conditioning) system It is one of the most important application fields of paper frame primary filters, suitable for central air conditioning and ventilation systems in buildings such as office buildings, shopping malls, hotels, hospitals, and residences. They remove large particles from incoming air to prevent buildup on system components like heat exchangers and fans. 2. Industrial production workshops Many industrial production environments (such as electronic assembly, mechanical processing, food processing, textile workshops, etc.) require basic air purification to reduce the impact of dust in the air on product quality or production equipment. The paper frame primary filter can be used as a pre-filtering device, installed at the ventilation air intake of the workshop or in local purification equipment, to initially filter large particle pollutants in the outside air or the circulating air within the workshop. 3. Pre-filtration for cleanrooms and laboratories In cleanrooms with high requirements for air cleanliness (such as pharmaceutical cleanrooms and semiconductor cleanrooms)

To extend the service life of plastic frame combined air filters, efforts should be made to reduce the load on the filter material, protect the frame and the filter material, and optimize the operating environment. Targeted measures should be taken in combination with the material characteristics and filtration principles. The specific methods are as follows: I. Reducing the Dust Accumulation Rate of Filter Materials (Core Idea) The dust-holding capacity of filter materials is limited. Reducing the total amount of pollutants entering the filter can directly extend its service life. Add a pre-filter Before the plastic frame combined filter (usually medium or sub-high efficiency), a primary filter (such as nylon mesh or non-woven fabric filter) is installed to intercept large particle dust (≥5μm) first, reducing the burden on the filter material of the main filter. In an air conditioning system, the primary filter can filter out over 80% of large particles, extending the lifespan of the subsequent medium-efficiency filter by 30% to 50%. Control the concentration of intake air pollution Optimize the outdoor air intake: Keep it away from pollution sources such as construction sites, roads, and factories. If necessary, install windshields or dust covers to reduce the direct inhalation of

To determine whether a plastic frame combined air filter needs to be replaced, it is necessary to comprehensively judge through methods such as resistance monitoring, appearance inspection, and performance testing based on its operating status, performance changes, and actual filtration effect. The specific methods are as follows: I. Judging through Resistance Changes (Core Indicator) The resistance of the filter will gradually increase as the dust holding capacity rises. When the resistance reaches the preset “final resistance”, it indicates that the filter material is close to saturation and must be replaced. Initial resistance: The resistance of the filter when it is not in use (product manuals usually indicate this, for example, the initial resistance of medium-efficiency filters is approximately 50-80Pa, and that of high-efficiency filters is about 100-200Pa). Final resistance: Generally set at 2 to 3 times the initial resistance (it can be determined according to the system design. For example, for a filter with an initial resistance of 80Pa, it needs to be replaced when the final resistance reaches 160 to 240Pa). Operation method: Install differential pressure gauges before and after the filter, and record the resistance changes regularly. When the value reaches the final resistance, it is the signal

The service life of plastic frame combined air filters is influenced by multiple factors and usually does not have a fixed uniform duration. It generally ranges from 1 to 12 months. The specific duration can be comprehensively judged based on the following key factors: I. Core Influencing Factors Filtration efficiency grade Primary filters (such as G1-G4) : Mainly filter large particle dust (≥5μm), with a relatively large dust holding capacity and a long service life, generally 3 to 6 months. Medium-efficiency filters (such as F5-F9) : They filter particles ranging from 1 to 5μm, have a medium dust holding capacity, and typically last for 2 to 4 months. Sub-high efficiency/high efficiency filters (such as H10-H14) : For particles smaller than 0.3μm, the filter material is dense, with a small dust-holding capacity and a relatively short service life, generally 1 to 3 months. In some high-cleanliness scenarios (such as operating rooms), the service life may be even shorter. The degree of pollution in the usage environment In severely polluted areas (such as near construction sites, textile workshops, and industrial zones with a lot of dust) : The concentration of dust in the air is high, and filters are prone to clogging,

Plastic frame combined air filters, with their diverse filtration efficiencies, flexible structures, and convenient installation and maintenance, are widely applicable in various scenarios, covering commercial and civil use, industrial production, medical and health care, and many other fields. Specifically as follows: I. Ventilation Systems for Commercial and civil Buildings Central air conditioning systems in large public places such as office buildings, shopping malls, hotels, stadiums, airports, and stations, which are densely populated, can serve as pre-treatment or terminal filtration devices for air circulation. They can effectively remove dust, pollen, and particulate matter from the air, improve indoor air quality, and reduce respiratory discomfort. Common civilian scenarios: home fresh air systems, small commercial air conditioners (such as restaurants, convenience stores), etc. It is especially suitable for scenarios with limited installation space and weight requirements. The lightweight feature of the plastic frame can reduce the installation difficulty. Ii. Industrial Cleanrooms and Production Workshops Precision manufacturing industry: In electronic, semiconductor, chip, and liquid crystal display (LCD) production workshops, these environments have extremely high requirements for air cleanliness (such as Class 100-Class 10000 cleanrooms, where “Class 100” refers to a cleanroom with no more than 100 particles larger than 0.5 microns per cubic foot

Excessive noise from the fan filter unit (FFU) can affect the comfort of the clean room environment, the stability of equipment and the health of personnel. To solve the problem, it is necessary to start from the noise sources (such as fan operation, air flow disturbance, structural vibration, etc.), take targeted measures in combination with the scene requirements, and at the same time avoid affecting the filtration efficiency and air volume performance. The following are the specific solutions 1. Optimize the equipment itself: Reduce noise from the source The core noise sources of FFU are the fan and the movement of the airflow. Noise generation can be directly reduced through structural improvements of the equipment. 1. Replace the type of low-noise fan Give priority to brushless DC fans Compared with traditional AC centrifugal fans, brushless DC fans adopt electronic commutation technology, featuring low mechanical friction and electromagnetic noise. Under the same air volume, the noise can be reduced by 5 to 10dB (A) (for example, from 65dB (A) to 55 to 60dB (A)), and they support precise variable frequency speed regulation. It can reduce the noise of airflow turbulence by lowering the wind speed (suitable for low-noise scenarios such as