When replacing the filter material of the aluminum frame combined filter, attention should be paid to the standardization of operation, safety and the guarantee of filtration effect. The following are detailed precautions: I. Preparations Before Replacement System shutdown and safety protection First, turn off the ventilation and air conditioning system where the filter is located. Make sure the machine is shut down before operating to prevent dust from spreading due to air flow or causing accidental contact by personnel. If the filtration environment contains harmful gases or dust (such as in chemical workshops), protective masks and gloves should be worn. If necessary, protective clothing should be worn to prevent pollutants from coming into contact with the skin or being inhaled into the body. Preparation of tools and new filter materials Prepare appropriate disassembly tools (such as screwdrivers, wrenches, snap-on screwdrivers, etc.), and check in advance whether the tools are in good condition to avoid damaging the aluminum frame during operation. Confirm that the specifications (size, filtration grade, material) of the new filter material are consistent with those of the original filter material and meet the system design requirements (such as air volume compatibility) to avoid a decrease in filtration efficiency

To determine whether the filter material of an aluminum frame combined filter needs to be replaced, a comprehensive judgment should be made based on multiple indicators such as filtration effect, resistance change, and appearance condition. The specific methods are as follows: I. Judgment through resistance monitoring (the most scientific method) Monitor the changes in pressure difference Install differential pressure gauges before and after the filter to record the initial resistance (the resistance after the new filter material is installed). When the operating resistance reaches 2 to 3 times the initial resistance, it indicates that the filter material is severely clogged and the filtration efficiency has dropped significantly. It needs to be replaced immediately. For instance, the initial resistance of a new filter material is 50Pa. When the resistance rises to 100-150Pa, the replacement threshold is reached. Abnormal fluctuation of resistance If the resistance suddenly drops significantly (far below the initial resistance), it may be that the filter material is damaged (such as having holes or tears), allowing unfiltered air to directly penetrate. An emergency inspection and replacement of the filter material are required. Ii. Judging by Appearance Status (Intuitive Observation Method) Dust degree on the surface area of the filter

The comprehensive maintenance cycle of the aluminum frame combined filter is not a fixed value. It needs to be comprehensively judged based on the usage environment, filtration load and type of filter material. The following are specific reference standards: I. Basic Comprehensive Maintenance Cycle (Regular Environment) In environments with low dust concentrations such as ordinary office Spaces and commercial buildings, it is recommended to conduct a comprehensive maintenance every three months. The contents include: inspection of the integrity of the aluminum frame structure (deformation, rust, sealing condition), assessment of the cleanliness of the filter material, comparative analysis of pressure difference data, and recheck of installation sealing performance, etc. Ii. Periodic Adjustment under Special Circumstances Highly polluted environment For places with high dust/fiber concentrations such as industrial workshops, construction sites, and textile factories, it is recommended to shorten the comprehensive maintenance to once every 1-2 months. The reason is that the filter material is prone to rapid clogging, and the aluminum frame may also wear out more rapidly due to the erosion of contaminants. More frequent inspections are needed to prevent filter failure. Damp/corrosive environment For instance, in food processing workshops, chemical workshops, etc., it is recommended to conduct a comprehensive

These filters are key equipment in air purification systems. Their daily maintenance directly affects filtration efficiency and service life. Here are the detailed maintenance points: Regular cleaning is essential. Dust the filter surface every week. Use dry compressed air to blow from downstream to upstream. Keep pressure at 0.2-0.3MPa to avoid damage from excessive pressure. For oil stains or dirt on the aluminum frame, wipe with a neutral cleaner. Then dry with a clean cloth to prevent corrosive residues from shortening the aluminum frame’s service life. Always turn off the ventilation system before cleaning for safety. ​ Do not overlook detailed inspection. Every month, inspect the filter’s sealing performance. Check for cracking or delamination at bonding points between the aluminum frame and filter material. Also, check whether the frame’s sealing strip is intact. If you find damage, holes, or obvious dust accumulation on the filter material, deal with these promptly. Inspect the aluminum frame for deformation or rust, especially in humid environments. Sand rust with fine sandpaper and apply anti-rust paint to prevent corrosion from spreading. ​ Timely replacement of filter media is the key to ensuring the filtration effect. When the resistance of the filter reaches 2 to 3

PTFE filters (with polytetrafluoroethylene as the core filter material) are mainly applied in special scenarios where conventional filters are difficult to adapt due to their resistance to extreme environments, chemical inertness, hydrophobicity and moisture resistance, etc. Specifically, they include Chemical and pharmaceutical industries: It is used for exhaust filtration of highly corrosive gases (such as acid and alkali volatile substances, organic solvent vapors), or tail gas treatment of reaction vessels and distillation equipment, and can withstand harsh chemical environments without being corroded. High-temperature working environment: It is suitable for the exhaust systems of high-temperature drying workshops and sterilization equipment (such as tunnel ovens, wet heat sterilization cabinets), and can stably filter within a wide temperature range of -200 ℃ to 260℃, avoiding the failure of filter materials due to high temperatures. High humidity and foggy scenarios: such as oil mist filtration in food processing (aquatic product and beverage workshops), damp laboratories, and spray painting workshops, etc. Its hydrophobic property can prevent the filter material from getting damp and caking, ensuring stable filtration efficiency. In the field of biosafety: In the exhaust systems of biosafety laboratories and virus research institutions, the uniform microporous structure of PTFE membranes can efficiently intercept microbial

PTFE filters (filters with polytetrafluoroethylene as the filter material) and high-efficiency filters without separators (high-efficiency filters with glass fiber and other main filter materials and without separators) have significant differences in terms of material, performance, application scenarios, etc. The following is a detailed comparison from the core dimensions: I. Differences in Core Materials and Structures Comparison items: PTFE filter, non-partitioned high-efficiency filter The core filter material is polytetrafluoroethylene (PTFE), which is a high-molecular polymer membrane material and features resistance to high and low temperatures as well as chemical inertness. The core filter materials are mostly superfine glass fibers, with a few being polypropylene (PP), etc. The filtration relies on the interception and adsorption functions of the fibers. Structural design: Filter materials are usually folded to increase the filtration area and can be matched with different support structures (such as metal or plastic frames), with or without separators (depending on the specific model). It adopts a design without separators, and the folded filter material is fixed by hot melt adhesive or silk thread, reducing air resistance and making the structure more compact. The frame materials are mostly corrosion-resistant materials such as stainless steel and aluminum profiles, which are suitable for harsh

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