When choosing a paper frame folding filter suitable for a specific application scenario, it is necessary to comprehensively consider the core requirements of the scenario (such as filtration accuracy, environmental conditions, system parameters, etc.) from multiple dimensions, including filtration efficiency, filter material characteristics, structural design, and environmental adaptability. The following are the specific selection methods and key points: First, clarify the core requirements of the application scenarios The core requirements for filtering vary greatly in different scenarios. The following basic information needs to be clarified first: Pollutant type: Is it large particle dust (such as over 5μm), fine dust (such as 1-5μm), or air with odor and moisture that needs to be filtered? Cleanliness requirements: What are the grade requirements for air cleanliness in scenarios (such as general ventilation, industrial production, near-clean environments, etc.)? System parameters: Air volume, air pressure of the supporting equipment, and installation space dimensions (length × width × thickness)? Environmental conditions: Temperature and humidity of the scene, and whether there are corrosive gases. Second, select the efficiency grade based on the filtration accuracy requirements. The core function of the paper frame folding filter is to intercept pollutants of specific particle sizes. The corresponding efficiency grade should

Paper frame folding filters are widely used in various fields and scenarios due to their moderate filtration efficiency, low cost, and easy installation, as follows: Air conditioning and ventilation systems Central air conditioning fresh air unit: As a primary filtration device, it filters large particles of dust, pollen, hair and other impurities in the outdoor air, protects the core components such as heat exchangers and fans inside the air conditioning system from being contaminated or clogged, and at the same time reduces the burden on subsequent medium and high-efficiency filters, extending the service life of the entire system. Commercial and household ventilation systems: In the ventilation systems of shopping malls, office buildings, hotels, residences, and other places, they are used to purify the air entering the room, improve indoor air quality, and provide people with a more comfortable breathing environment. Cleanroom-related scenarios Cleanroom return air filtration: In cleanrooms of industries such as electronics, pharmaceuticals, and precision instruments, paper frame folding filters are often used in the return air system to filter out some dust in the circulating air inside the room, maintaining the air cleanliness level of the cleanroom and ensuring the stability of the production or experimental environment. Pre-treatment

To prevent common faults of automatic lifting transfer Windows, systematic protective measures should be established from multiple dimensions, such as standardized operation, preventive maintenance, environmental adaptation, and regular calibration, and targeted prevention should be carried out in combination with the structural characteristics of the equipment and the usage scenarios. The following are the specific methods: I. Operating Norms: Reduce human-induced malfunctions from the source Strictly abide by the load and item restrictions Before transferring items, make sure the weight does not exceed the rated load of the equipment (usually marked on the side of the equipment), and overloading is strictly prohibited (to avoid overloading and burning out of the lifting motor or deformation of the transmission components). Only items that are well sealed should be transferred. Liquids, loose powders, and sharp objects (unpackaged) are strictly prohibited from entering the cavity to prevent internal contamination, component corrosion, or scratches on the tracks. When passing items, handle them gently to avoid violent impact on the lifting platform (to prevent deformation of the platform surface or false triggering of the sensor). Eliminate any illegal operation behaviors. Do not force the door open during the lifting process (it will trigger the interlock protection, but

In addition to daily maintenance, when the automatic lifting transfer window is used in specific scenarios, during special usage stages, or in response to emergencies, targeted special maintenance measures also need to be taken to adapt to complex environments, extend the service life of the equipment, and ensure its core functions. The following are the key special maintenance measures: I. Specialized maintenance in Extreme Environments High humidity/corrosive environments (such as laboratories, pharmaceutical workshops) Strengthen anti-corrosion treatment: Conduct anti-corrosion inspections on metal parts (such as lifting tracks and motor housings) every quarter. If the surface coating peels off, apply food-grade anti-corrosion coatings (such as Teflon coatings) promptly to prevent rust. Moisture-proofing of electrical components: Install moisture-proof desiccants in the control box (replace them monthly), and regularly test the insulation resistance of the circuit with an insulation meter (≥1MΩ) to prevent short circuits caused by moisture. Seal strengthening: Switch to acid and alkali-resistant fluororubber sealing strips instead of ordinary silicone strips. Check the aging condition every 2-3 months and replace them in advance to maintain the seal. High-frequency usage scenarios (such as hospital operating rooms, electronic clean workshops) Shorten the maintenance cycle: Reduce the filter replacement cycle from 3 to 6 months

The daily maintenance of automatic lifting transfer Windows not only requires following the standard procedures but also paying attention to some key details to avoid equipment damage or affecting the clean environment due to improper operation. The following are the core points to note in daily maintenance: I. Taboos of Cleaning and Maintenance Avoid using corrosive cleaning agents It is strictly prohibited to wipe the surface of the equipment, sealing strips, or lifting tracks with corrosive solutions such as alcohol (concentration > 75%), strong acids, or strong alkalis. Otherwise, it will cause aging of plastic/metal parts, cracking of sealing strips, and damage to the sealing performance and appearance of the equipment. When cleaning the filter, do not rinse or soak it with water to prevent the filter material from becoming ineffective. Only compressed air can be used to blow away surface dust (for non-high-efficiency filters), or the filter can be replaced directly. Prevent moisture from entering key components. When cleaning, avoid water flowing into electrical control boxes, motors, sensors, and other electrical components to prevent short circuits or leakage. If water splashes accidentally, power should be cut off immediately and the area dried. Only after confirming that it is completely

The automatic lifting transfer window is a crucial device used for transferring items in clean rooms, laboratories, and other similar environments. Its daily maintenance is crucial for ensuring the normal operation of the equipment and maintaining a clean environment. The following are the specific key points for daily maintenance I. Cleaning and Maintenance Surface cleaning Wipe the inner and outer surfaces of the transfer window, door frames, and sealing strips daily with a neutral cleaner (such as soapy water) to remove dust and stains. Avoid using corrosive cleaners (such as solutions with excessive alcohol concentration) to prevent damage to the surface of the equipment or sealing materials. After cleaning, dry it with a clean dry cloth to ensure there is no standing water left, especially in the corners and crevices. Filter maintenance Check the appearance of the high-efficiency filter every week. If any damage, excessive dust accumulation, or unpleasant smell is found on the surface, it should be replaced in time. According to the usage frequency (usually every 3 to 6 months), the resistance of the filter should be tested. When the resistance exceeds 1.5 times the initial value, the filter must be replaced to ensure cleanliness. Cleaning of the

The airflow pattern of the vertical flow workbench is the core for achieving a local clean environment. Through the directional, stable, and filtered vertical airflow, a “clean barrier” is formed, which can not only prevent external contamination from entering the operation area, but also quickly remove the contaminants generated during operation. Its airflow pattern can be analyzed in detail from three aspects: “airflow path”, “airflow characteristics”, and “core function”. I. Airflow path: Unidirectional circulation from top to bottom The airflow of the vertical flow workbench follows a closed-loop path of “intake air → filtration → vertical supply air → return air/exhaust air”, and the specific process is as follows: Air introduction Outside air (or part of the indoor circulating air) enters the equipment through the primary filter at the back or top of the workbench, first removing large particles of dust (≥5μm) from the air to protect the downstream high-efficiency filter. High-efficiency filtration The air that has passed the primary filter is sent into the static pressure box at the top by the fan (the internal space is designed as a uniform pressure area), and then undergoes deep filtration through the high-efficiency filter (HEPA or ULPA) below the static pressure

Vertical flow workbenches are widely used in fields with strict requirements for environmental cleanliness, sterility, or precision due to their features, such as high local cleanliness, stable airflow orientation, and strong operational safety. Its core function is to form a “pollution isolation barrier” through vertical unidirectional clean air flow, which not only protects the operation object from external contamination but also reduces the impact of pollutants generated during the operation on the operator or the environment. The following are specific application fields and scenario descriptions: I. Biomedical and Life Sciences Field This is the most core application area of vertical flow workbenches, mainly used for aseptic operations and biosafety protection to prevent microbial contamination of experimental samples or operators. Cell and tissue culture During the inoculation, passage, and culture of animal cells and plant tissues (such as tissue culture seedlings), it is necessary to strictly avoid contamination by bacteria, fungi, and other microorganisms. The sterile airflow of the vertical flow workbench can create a Class 100 (≥0.5μm particles ≤100 per cubic foot) clean environment, ensuring the purity of the culture. The operation of sensitive samples such as stem cells and genetically engineered cells has extremely high requirements for environmental cleanliness.

To determine whether a folded frame combined filter needs to be replaced, a comprehensive judgment should be made based on multiple factors such as the attenuation of its filtration performance, changes in resistance, appearance condition, and usage environment, to avoid premature replacement causing waste, or late replacement affecting system operation. The following are the specific judgment methods and indicators: I. Core judgment Index: Resistance (pressure difference) reaches the upper limit The air resistance (pressure difference) of the filter is the most direct indicator to determine whether it is clogged and is also the most commonly used basis for replacement in the industry. Principle: The resistance of a new filter is relatively low (referred to as “initial resistance”). As the filtered dust accumulates continuously, the pores of the filter material are blocked, and the resistance when air passes through gradually increases (referred to as “final resistance”). When the resistance reaches the “final resistance” specified by the manufacturer, it indicates that the filter material is saturated and must be replaced. Operation method Install differential pressure gauges (such as U-tube differential pressure gauges or electronic differential pressure transmitters) before and after the filter to monitor resistance changes in real time. Record the “initial

The folded frame combined filter, with its large filtration area, low air resistance, high dust holding capacity, and moderate cost, is mainly used as the “primary or intermediate filtration barrier” of the air purification system. It is widely applied in scenarios that require pre-treatment of air, protection of downstream equipment, or maintenance of a basic clean environment. The following is the classification of its typical applicable scenarios and specific explanations: I. Primary filtration of air conditioning and ventilation systems This is the most core application field of the folded frame combined filter, mainly used to remove large particle impurities in the air, reduce the burden on subsequent filtration equipment, and extend the service life of the system. Commercial central air conditioning: For the fresh air systems of large buildings such as office buildings, shopping malls, and hotels, it is necessary to first filter out particles of ≥5μm such as dust, pollen, and hair in the outdoor air to prevent these impurities from entering the air ducts and accumulating or polluting the indoor environment. The large air volume feature of the folded frame structure can match the high air volume demand of the air conditioning system (usually up to 1000-5000m³/h), and

Due to differences in filter material types, structural designs, sealing materials, etc., the service life of different types of liquid trough air filters (mainly referring to the filter material replacement cycle and the service life of the sealing system) will vary significantly. The following is an analysis of their lifespan differences based on common classification methods: I. Classification by Filtration Efficiency Grade (Core Impact on Filter Material Lifespan) Liquid trough filters typically correspond to high efficiency (HEPA) and ultra-high efficiency (ULPA) grades. The higher the efficiency, the smaller the pore size of the filter material, and the more obvious the difference in dust holding capacity and service life. H13-H14 grade (High Efficiency) The filter materials are mostly superfine glass fiber filter paper, with a filtration efficiency of ≥99.97% (H13) or ≥99.995% (H14) for 0.3μm particles. The dust holding capacity is moderate (about 150-250g/m²). In conventional clean environments (such as ISO Class 5 workshops), the filter material replacement cycle is approximately 6-18 months. If the pre-filtration is complete (primary and medium efficiency pre-treatment), it can be extended to two years. The lifespan of sealant is not affected by efficiency, and high-quality materials can still last for more than 10 years. U15-U17

The service life of liquid trough air filters is influenced by multiple factors. Generally, it is necessary to make a comprehensive judgment by combining the service life of the filter medium and the sealing system. The overall service life range is relatively wide, as follows: I. Core Influencing Factors The service life of the filter medium Filtering media (such as superfine glass fiber filter paper, PTFE-coated materials) are the core for intercepting pollutants, and their lifespan mainly depends on: Environmental dust concentration: If there is a lot of dust and particles in the usage environment (such as a workshop close to a pollution source), the filter material will clog more quickly, and its service life will be shortened. Conversely, environments with higher cleanliness levels (such as electronic cleanrooms) can extend the lifespan. Air volume and air velocity: Excessively high air velocity will accelerate the wear and clogging of filter materials. It is generally recommended to operate at the designed air volume. The performance of the filter material itself: High-quality filter materials (such as anti-aging and anti-fracture composite materials) can withstand a higher dust holding capacity and have a longer service life. The lifespan of the sealing system The sealant of