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

The noise level of the fan filter unit (FFU) is a key factor that cannot be ignored in the selection process, directly affecting the working environment, personnel comfort and equipment operation stability of the clean room. Its specific impact on the selection is mainly reflected in the following aspects: 1. Determine whether it meets the noise limit requirements of the cleanroom Cleanrooms in different application scenarios have clear mandatory or recommended standards for noise, and the noise level is the “entry threshold” for selection. Pharmaceutical and food cleanrooms: They must comply with GB 50457 “Code for Design of Clean Rooms in Pharmaceutical Industry”, with noise levels ≤60dB (A). Some aseptic filling areas even require noise levels ≤55dB (A) to prevent noise from interfering with the operators’ attention and reduce the risk of contamination. Semiconductor and precision electronics workshops: Precision equipment (such as photolithography machines and wafer inspection equipment) is sensitive to vibration and noise. The noise level should be ≤60dB (A). Excessive noise may be transmitted through the air or structure, affecting the accuracy of the equipment and leading to a decrease in product yield. Laboratory and biosafety cabinet accessories: Researchers need to work indoors for long periods of time.

The selection of the fan filter unit (FFU) directly affects the purification effect, operating cost and stability of the cleanroom, and needs to be comprehensively evaluated in combination with specific application scenarios. The following are the core factors that need to be given priority consideration when making a selection: I. Cleanliness Requirements This is the primary basis for selection, determining the type and performance parameters of the filter: Particle size and filtration efficiency If a Class 1000 to 100,000 cleanroom is required (such as for general electronic assembly and food processing), a HEPA filter (with an efficiency of ≥99.97% for 0.3μm particles) is sufficient. If Class 1 to 100 is required (such as in semiconductor wafer manufacturing, biomedicine aseptic workshops), ULPA filters (with an efficiency of ≥99.999% for 0.12μm particles) should be selected. Air cleanliness grade standards: It is necessary to refer to standards such as ISO 14644-1 and FS 209E, clearly define the maximum allowable particle concentration in the target area, and then invert the filtration efficiency requirements of the FFU. Ii. Air Volume and air change Rate Air volume is the core performance parameter of FFU and needs to match the volume and air change rate requirements of

The Fan Filter Unit (FFU) is a key purification device in clean rooms (controlled environments designed to minimize particulate contamination), dust-free workshops and other places. Its core function is to achieve local air purification by using a fan to push air through high-efficiency filters. These filters include HEPA (High-Efficiency Particulate Air, which captures very fine particles) or ULPA (Ultra-Low Penetration Air, which captures even smaller particles). According to different classification criteria, FFU can be divided into various types. The following are common classification methods and specific types: I. Classification by filter type This is the most crucial classification method, which directly determines the filtering efficiency of the FFU: Hepa-type FFU: Equipped with high-efficiency air filters (HEPA, which stands for High-Efficiency Particulate Air), it can achieve a filtration efficiency of over 99.97% for particles with a diameter of ≥0.3μm (micrometers, a micrometer is one millionth of a meter), and is suitable for most clean rooms (such as Class 1000 to Class 100,000, where the class indicates the maximum allowed particles per cubic foot). ULPA type FFU: Equipped with ultra-high efficiency air filters (ULPA, or Ultra-Low Penetration Air), it can achieve a filtration efficiency of over 99.999% for particles with a diameter

As a key piece of equipment for material transfer in clean environments such as laboratories, pharmaceutical workshops, and electronic clean rooms, the daily maintenance of embedded transfer Windows must strictly follow the regulations to ensure cleanliness, prevent cross-contamination, and extend the service life of the equipment. The following are the core precautions for daily maintenance: I. Precautions for Cleaning and Disinfection Cleaning frequency and timing After daily use, the internal cavity, door body, and handle should be cleaned. If it is used in high-risk scenarios (such as biological laboratories and aseptic pharmaceutical areas), disinfection should be carried out immediately after each material transfer. Before cleaning, the power supply of the transfer window must be turned off to ensure that the ultraviolet lamp, fan, etc., are not running, avoiding electric shock or direct ultraviolet radiation damage. Selection of cleaning tools and reagents Dust-free cloths and special clean cloths should be used (avoid using ordinary cloths to prevent fiber shedding and contamination), and 75% medical alcohol, peracetic acid, or disinfectants that meet the on-site requirements (such as sporicides commonly used in pharmaceutical workshops) should be used. Do not use corrosive cleaning agents (such as strong acids and strong alkalis) to avoid damaging

The filter with an embedded transfer window (usually a high-efficiency HEPA or ULPA filter) is the core component for maintaining its clean function. The replacement process must strictly follow the aseptic and dust-free operation norms to avoid contaminating the clean environment inside and around the transfer window. The following are the detailed replacement steps and precautions: I. Preparations Before Replacement Confirm the replacement conditions When the surface of the filter is damaged or deformed, or the resistance detected by the differential pressure gauge exceeds 1.5 times the initial resistance (usually the resistance of a new filter is 200-250Pa, and it needs to be replaced when it exceeds 300-375Pa), or when it reaches the manufacturer’s recommended service life (generally 6-12 months, depending on the cleanliness of the environment), replacement should be arranged. Prepare new filters of the same model and specification in advance (pay attention to the filtration efficiency grade, such as H13 and H14 grades, which must meet the on-site cleanliness requirements), and check whether the packaging of the new filters is intact and whether there is a certificate of conformity. Preparation of tools and consumables Tools: Screwdriver (select cross/flat-head according to the filter fixation method), wrench, lint-free cloth, special

The embedded transfer window, as a key device for controlling cross-contamination in clean environments, directly affects the purification effect and service life through its daily maintenance. Maintenance should revolve around the four core aspects of “cleaning, inspection, calibration, and replacement of consumables”, and formulate standardized procedures in combination with the equipment structure (interlock devices, purification systems, sealing components, etc.). The specific methods are as follows: 1. Daily basic cleaning: Keep the interior clean Surface wiping Use a lint-free cloth dipped in 75% medical alcohol or neutral detergent (such as a diluted solution of dishwashing liquid) to wipe the inner walls of transfer Windows, the inner sides of doors, shelves, and other surfaces to remove any remaining dust, stains, or liquid marks. Pay special attention to cleaning the areas prone to dust accumulation, such as the ultraviolet lamp and the air outlet of the filter, to avoid obstruction and affect the function. After cleaning, wipe it a second time with a lint-free cloth moistened with pure water or sterile water to remove any residue of cleaning agents (especially in the pharmaceutical and food industries). Cleaning of the sealing rubber strip Use a soft-bristled brush or lint-free cloth to clean the dust

The embedded transfer window is a device installed in the walls of clean rooms, laboratories, hospital operating rooms, and other places that require strict control of environmental cleanliness. It is mainly used to transfer items between areas of different cleanliness grades or between internal and external environments, while minimizing air cross-contamination to the greatest extent. Its working principle revolves around “isolating pollution and achieving efficient purification”, as follows: I. Core Design: Physical Isolation and Interlock Mechanism Bidirectional isolation structure Transfer Windows are usually of box-type structure, embedded in the wall, with doors on both sides (generally made of stainless steel and with good sealing performance), which respectively lead to two areas of different cleanliness grades (such as clean area and non-clean area). The core of it is the interlocking device: when one side door is opened, the other side door will be locked by mechanical or electronic devices. It cannot be opened simultaneously, thereby preventing direct air convection between the two areas and avoiding contaminants from entering the clean area with the air. Sealing design The contact area between the door and the box body is usually equipped with anti-aging and elastic sealing strips to ensure airtightness when the door

The performance of chemical fiber bag and glass fiber bag air filters (such as filtration efficiency, resistance, service life, etc.) is influenced by multiple factors, which not only include the characteristics of the filter material itself but are also closely related to the usage environment and system design. The following is a detailed analysis from three dimensions: filter material characteristics, structural design, and usage conditions: I. Core Characteristics of the Filter Material Itself Filter material is the foundation of filter performance, and its material and fiber morphology directly determine the filtration capacity. Fiber material and physical properties For chemical fiber bags, the diameter, toughness, and heat resistance of synthetic fibers such as polyester (PET) and polypropylene (PP) are crucial. For instance, fine denier polyester fibers (with a diameter of 2-5μm) have a higher filtration efficiency than coarse fibers (10-20μm), but their dust-holding capacity is slightly lower. Polypropylene fibers are resistant to acid and alkali corrosion and are suitable for chemical scenarios, while ordinary polyester is prone to aging in strong acid and alkali environments. Fiberglass bags: The diameter of the glass fiber (usually 1-3μm), the strength of the single filament, and the alkali content all affect the performance. Ultrafine glass

There are significant differences between chemical fiber bag air filters and glass fiber bag air filters in terms of filtration performance, material properties, and applicable scenarios. When making a choice, specific requirements (such as filtration accuracy, environmental conditions, cost, etc.) should be comprehensively considered. The following is an explanation based on the core differences I. Differences in Filter Material and Structure Chemical fiber bag filter The filter material is mainly made of synthetic fibers such as polyester (PET) and polypropylene (PP), which are soft and strong in toughness. It is produced through processes such as spunbonding and meltblown. The structure of filter bags is usually a multi-layered pleated or fluffy bag-like, with uniform distribution of voids between fibers and large dust-holding Spaces. Fiberglass bag filter The filter material is centered on glass fiber, which is hard in texture and relatively brittle. It is made through layer-by-layer superposition or weaving processes. Glass fibers have a finer diameter (down to the micrometer level), a higher fiber density, and a more compact filter layer structure. Ii. Differences in Applicable Scenarios Typical scenarios of chemical fiber bag filters Medium and low-efficiency filtration of central air conditioning fresh air/return air systems (such as in office