The working principle of the high-efficiency exhaust and filtration device is to achieve the capture, separation and purification of air pollutants through the synergistic effect of power-driven exhaust and multi-stage filtration and purification, while controlling the direction of air flow, and ultimately discharging clean air or qualified exhaust gas. Its core process can be broken down into the following key links: I. Airflow Directional guidance The device generates negative or positive pressure power through fans (centrifugal fans, axial flow fans, etc.) to form a directional air flow path, ensuring that pollutants are “targeted” collected. Negative pressure guidance: In most scenarios (such as fume hoods and biosafety cabinets), the device creates a local negative pressure in the area where pollutants are generated (such as laboratory benches and production workstations), allowing the surrounding air and pollutants to naturally flow into the device and preventing them from spreading to the external environment. Positive pressure discharge: The purified air or waste gas is pressurized by a fan and discharged to the outside or subsequent treatment system along a preset path (such as an exhaust pipe) to ensure stable airflow and no backflow. Second, multi-stage filtration and purification Depending on the type of pollutants (particulate

The high-efficiency exhaust and filtration device integrates exhaust and high-precision filtration, effectively removing particulate matter, harmful gases, microorganisms, and other pollutants. It is essential in fields with strict air cleanliness and safety requirements. Its main application fields include: I. Medical and health care field Hospital clean rooms and operating rooms: During procedures, aerosols and volatile substances are produced. High-efficiency exhaust and filtration devices quickly remove contaminants, maintain sterility, and reduce patient infection risk. Infectious disease isolation ward: For isolation wards where patients with respiratory infectious diseases are located, this device can filter and expel the virus-containing aerosols exhaled by the patients in a timely manner through directional exhaust ventilation, preventing the spread of the virus within the ward. Biosafety laboratory: Such laboratories, which handle highly pathogenic microorganisms, require strict airflow control. High-efficiency exhaust and filtration devices (e.g., biosafety cabinet exhausts) filter harmful microorganisms generated during experiments, preventing leaks and protecting personnel and the environment. Ii. Industrial manufacturing field In the electronics manufacturing industry, during the production processes of chips, semiconductors, and precision electronic components, extremely high requirements are placed on dust particles in the air (typically requiring a cleanliness level ranging from Class 1 to Class 100). The high-efficiency exhaust

The air flow organization form of a laminar flow hood is the core factor determining its cleaning effect, operational convenience and protective performance. It mainly works by the fan driving the air to be processed by the filtration system and then form a stable air flow barrier in the working area in a specific direction. The common forms of air flow organization can be divided into two major categories: horizontal laminar flow and vertical laminar flow. Some special models will combine the characteristics of both or add auxiliary air flow designs, as follows: 1. Horizontal Laminar Flow Clean Bench Airflow direction: The filtered clean air is blown out horizontally from the rear side (or left/right side) of the workbench perpendicularly to the operating surface, flows along the workbench surface to the operator’s side (or front side), and finally returns from the edge or bottom of the workbench surface. Features The airflow directly covers the entire operation surface, providing a more direct effect on the cleanliness and protection of the surface. It is suitable for operations with high requirements for the cleanliness of the workbench (such as the assembly of electronic components and the debugging of precision instruments). As the airflow

A laminar flow hood is a purification device that provides a local dust-free and sterile working environment. Its core function is to control the dust, microorganisms and other contaminants in the working area at an extremely low level through an air filtration system (usually combined with high-efficiency filters), while forming a stable air flow barrier to prevent external contamination from entering. With this feature, it is widely applied in multiple fields with strict requirements for environmental cleanliness: I. Life Sciences and biomedicine Field Microbiological experiments: It is used for the isolation, culture and identification of bacteria, fungi, viruses and other microorganisms, to prevent experimental samples from being contaminated by miscellaneous bacteria in the environment, and at the same time protect operators from exposure to pathogenic microorganisms (some biosafety type laminar flow hoods can achieve bidirectional protection). Cell and tissue culture: In animal cell culture, plant tissue culture, and stem cell research, it provides a sterile environment for cell growth to prevent cell contamination that could lead to experimental failure. Molecular biology experiments: such as PCR amplification, gene cloning, nucleic acid extraction and other operations, it is necessary to avoid nucleic acid contamination or interference from exogenous DNA. A laminar flow

The resistance size of the folded frame combined filter is an important indicator to measure its performance, directly affecting the energy consumption and operational efficiency of the ventilation system. Its resistance (including initial resistance and final resistance) is mainly related to the following factors: 1. The characteristics of the filter material itself Material and structure: The fiber density, diameter and porosity of different filter materials vary significantly. For instance, superfine glass fiber filter materials, due to their fine fibers and low porosity, have a stronger ability to block air flow, and their resistance is usually higher than that of loose materials such as non-woven fabrics or nylon nets. If the fibers of the pleated structure filter material are arranged in a disorderly manner, it will increase the flow path around the air flow, and the resistance will also rise accordingly. Thickness: The greater the thickness of the filter material, the longer the path for the airflow to pass through, the higher the probability of collision and friction with the fibers, and the resistance accordingly increases. For instance, the filter material thickness of high-efficiency filters is usually greater than that of primary filters, and their initial resistance is also higher. 2.

The folded frame combined filter, with its large filtration area and low resistance, suits many scenarios, primarily including: ventilation and air conditioning systems for civil buildings. In office and commercial spaces such as office buildings, shopping malls, and meeting rooms, central air conditioning or ventilation systems often use these filters as pre-filters. They remove dust and lint, reducing dust buildup inside the system, maintaining equipment efficiency, and ensuring good indoor air quality. Medical and transportation facilities: In large areas such as hospital general treatment zones, airport waiting halls, and high-speed rail station waiting halls, the filter acts as a primary or medium-efficiency filter to remove airborne particles. Used with other purification equipment, it maintains air quality and reduces health risks. Industrial air purification process As a pre-filtration device: In general industrial plants such as metallurgy, petroleum, chemical engineering and mechanical manufacturing, their centralized ventilation systems or large air compressors often use it as a pre-filtration device to first intercept large particles of dust and impurities, thereby reducing the burden on the subsequent filtration equipment and extending the service life of the core filtration components. Achieve general air purification: It is used for general air purification and intermediate filtration in 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