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

Liquid trough air filters, with their unique structural design and material properties, have significant advantages in the field of air purification, especially suitable for scenarios with extremely high requirements for cleanliness and sealing performance. Its core advantages are as follows: It has extremely strong sealing performance and an extremely low leakage rate This is the core advantage of the liquid tank filter. A flexible seal is formed between its frame and the installation frame through a liquid groove sealant (such as silicone gel, polyurethane glue, etc.): when the filter is embedded in the frame, the sealant will tightly fill all the gaps after being squeezed. Even if the equipment vibrates slightly or the frame deforms slightly due to temperature changes, it can still maintain a gap-free fit. Compared with traditional mechanical compression seals (which rely on hard fixation such as bolts and clips and are prone to micro-cracks due to uneven stress), the leakage rate of liquid trough seals can be reduced to less than 0.001%, almost eliminating the risk of “side leakage” and ensuring that 100% of the air entering the clean space is filtered. 2. High filtration efficiency, suitable for ultra-clean scenarios The filter media mostly adopt ultra-fine

Liquid through air filters, with their high sealing performance and high filtration efficiency (the filtration efficiency for 0.1-0.3μm particles can reach over 99.9995%), are mainly applied in scenarios with extremely high requirements for air cleanliness, especially suitable for environments where dust, microorganisms, and harmful particles need to be strictly controlled. The following are its typical application scenarios: 1. Cleanroom and precision manufacturing industries Electronics industry In the production workshops of semiconductor chips, integrated circuits, and microelectronic components (such as photolithography and packaging processes), the concentration of dust particles in the air (especially those smaller than 0.1μm) must be extremely low; otherwise, it may lead to short circuits in the chips and a decrease in yield. As a terminal filtration device, the liquid tank filter can ensure that the clean room meets Class 1 (ISO Class 1) or higher standards. Optics and Precision Instrument Manufacturing In the production environment of optical lenses, laser equipment, and precision sensors, it is necessary to prevent particles from adhering to the product surface and affecting accuracy. Liquid trough filters can effectively remove fine dust in the air and ensure product performance. 2. Biomedical and medical health fields Pharmaceutical industry The production workshops (GMP clean areas)

The classification of clean benches is mainly based on the direction of air flow and application scenarios. Among them, the direction of air flow is the most crucial classification basis, directly determining the functional characteristics and application scope of the equipment. The following are the specific classifications: I. Classification by Airflow Direction (The main classification method) Horizontal flow clean bench Airflow characteristics: Clean air is blown out from the high-efficiency filter at the back (or side) of the workbench, flows horizontally through the operation area, and is finally discharged from the front or the other side. Core advantages: The airflow directly covers the operation area, providing better cleanliness and protection for the samples. Moreover, the airflow path is short, resulting in relatively low energy consumption. Limitations: The airflow may directly blow towards the operator. If handling volatile, toxic or pathogenic substances, it can easily lead to personnel exposure, and the safety is relatively weak. Applicable scenarios: It is suitable for low-risk, non-pathogenic clean operations, such as electronic component assembly, precision instrument maintenance, and inoculation of common microorganisms (non-pathogenic bacteria), etc. 2. Vertical flow clean bench Airflow characteristics: Clean air is blown vertically downward from the high-efficiency filter at the top

The airflow velocity of a vertical flow workbench is usually adjustable, but the specific adjustment capacity depends on the design model and functional configuration of the equipment. The design for regulating the airflow velocity is mainly aimed at meeting the differentiated requirements for cleanliness and safety in various operating scenarios. The following is a detailed description: I. Feasibility of Regulating Air Flow Velocity Most mid-to-high-end models support adjustment. Mainstream vertical flow workbenches (especially those used in fields with strict environmental requirements such as biomedicine, pharmaceuticals, and electronics) are usually equipped with wind speed adjustment functions. Through the knobs, buttons, or touch interface on the control panel, the airflow speed can be adjusted within a certain range (typically 0.3-0.5m/s). This is the range of air velocity recommended by international standards for clean benches, which can be continuously or stepwise adjusted. Some basic models may have a fixed air velocity: A few economical or simple vertical flow workbenches (such as equipment temporarily used in small laboratories) may adopt a fixed air velocity design. Their fan power and air duct structure are fixed, and the air velocity cannot be adjusted, only meeting the basic cleanliness requirements. Ii. The core purpose of regulating air

The core working principle of the vertical flow workbench is to create a local high-cleanliness environment in the operation area through vertical unidirectional clean air flow, while achieving bidirectional protection for the operator, operation samples, and the external environment. Its specific workflow and key mechanisms are as follows: I. Core Mechanism: Vertical Unidirectional flow and Efficient filtration The core of the vertical flow workbench is to filter air with HEPA (High Efficiency Air Filter) or ULPA (Ultra-High Efficiency Air Filter), and through a specific air duct design, make the clean air flow through the operation area in a vertical direction (from top to bottom) to form an “air curtain barrier”, which specifically includes three key links: Air intake and primary filtration External air (or part of the circulating air) is first drawn in by the built-in fan of the workbench, and then processed by the primary filter to remove large particles of dust (such as particles with a diameter of ≥5μm) from the air, protecting the subsequent high-efficiency filter from contamination and extending its service life. High-efficiency filtration (core purification The air that has undergone initial filtration enters the HEPA/ULPA filter (with a filtration efficiency of ≥99.97%@0.3μm particles, and ULPA

A vertical flow workbench is a device that creates a local sterile and dust-free environment through clean air flow in the vertical direction. Its core function is to provide a highly clean working space for the operation area, while effectively protecting operators and the environment from the influence of contaminants during experiments or production processes. It has extensive and crucial applications in multiple fields, as follows: I. Biomedical and Life Sciences Field This is one of the core application areas of vertical flow workbenches, mainly utilizing their sterile environment to ensure the accuracy and safety of biological experiments. Cell culture: In cell biology research, whether it is the culture of animal cells, plant cells, or microbial cells, a strictly sterile environment is required. The vertical flow workbench can effectively filter bacteria, fungi, and other microorganisms in the air, prevent cell contamination, and ensure the purity of the culture system. Microbiological research: When handling microbial samples such as bacteria, viruses, and fungi, the vertical flow workbench can prevent the samples from spreading to the external environment and protect the operators from pathogenic microorganisms. It is particularly suitable for experiments such as the isolation and identification of pathogenic microorganisms. Molecular biology experiments,

La vida útil de los filtros resistentes a altas temperaturas está influida por múltiples factores y varía enormemente, oscilando normalmente entre varios meses y varios años. Los principales factores que influyen son el entorno de uso, las características del material del filtro, los métodos de mantenimiento, etc. A continuación se presenta un análisis específico: I. Factores principales que influyen Temperatura de funcionamiento y duración Cuanto más alta es la temperatura, más rápida es la velocidad de envejecimiento de los materiales filtrantes (como la fibra de vidrio, la cerámica y la malla metálica). Por ejemplo, la vida útil de un filtro que funciona continuamente a 300℃ puede ser de 30% a 50% más corta que la de un filtro que funciona a 150℃. El funcionamiento intermitente (como el funcionamiento durante 8 horas al día) tiene una vida útil más larga que el funcionamiento continuo durante 24 horas porque el material filtrante tiene tiempo de "descanso" y enfriamiento, lo que reduce los daños por fatiga térmica. Las propiedades del medio filtrante Concentración de polvo y dureza: El polvo de alta concentración (como el metalúrgico y el de los gases de combustión de las calderas) puede obstruir rápidamente los materiales filtrantes y acortar su vida útil. Las partículas duras (como los restos metálicos) pueden desgastar la superficie del material filtrante y acelerar su deterioro. Corrosividad: Si el gas a alta temperatura contiene componentes ácidos o alcalinos (como sulfuros y cloruros en gases residuales químicos), corroerá el material del filtro o el sellado.

Los filtros resistentes a altas temperaturas son dispositivos de purificación de aire que pueden mantener la eficacia de filtración y la estabilidad estructural en entornos de altas temperaturas (normalmente soportan temperaturas de ≥150℃, y algunos modelos especiales pueden soportar temperaturas superiores a 300℃). Sus materiales filtrantes están hechos principalmente de materiales resistentes a altas temperaturas, como fibra de vidrio, fibra cerámica y fibra metálica, y los marcos y las piezas de sellado también están hechos de materiales resistentes a altas temperaturas (como acero inoxidable, caucho de silicona, etc.). Este tipo de filtro se aplica principalmente en escenarios en los que hay un flujo de aire a alta temperatura y es necesario controlar la contaminación por partículas. Sus principales áreas de aplicación son las siguientes 1. Procesos de producción a alta temperatura en la industria Metalurgia y procesamiento de metales Durante los procesos de fabricación de acero, laminación de acero, forja, etc., los gases de combustión a alta temperatura o el flujo de gases contienen una gran cantidad de polvo metálico y partículas de oxidación. Los filtros resistentes a altas temperaturas pueden utilizarse para purificar el gas a alta temperatura descargado de hornos y estufas, reducir el desgaste de los equipos posteriores (como los dispositivos de recuperación de calor) y, al mismo tiempo, disminuir la contaminación atmosférica. La purificación del aire circulante en los talleres de tratamiento térmico de metales (como recocido y temple) evita que el polvo de alta temperatura se adhiera a la superficie de las piezas y afecte a la calidad del producto. Ingeniería química