The performance of high-temperature resistant air filters with separators (core indicators include filtration efficiency, resistance, dust holding capacity, temperature stability, and structural integrity) is influenced by multiple factors. It is not only directly related to the design, material selection, and manufacturing process of the product itself, but also closely associated with the environmental conditions and operating parameters of the actual application scenarios. The following breaks down the key influencing factors from two major dimensions: “product’s own attributes” and “external usage conditions” I. Product inherent attributes: Determine the “upper limit of basic performance” of the filter Such factors are the core design and manufacturing indicators of the filter before it leaves the factory, directly determining its filtration capacity and temperature reliability under rated conditions, and they are the “inherent conditions” of performance. 1. Filter material selection: The core of filtration efficiency and temperature resistance Filter material is the core component for filters to achieve “air purification”. Its material, structure and processing technology directly determine the filtration efficiency, upper limit of temperature resistance and dust holding capacity, and are the primary factors affecting performance. Filter material: It is necessary to meet the dual requirements of “high-temperature resistance” and “filtration efficiency” simultaneously. The

High-temperature resistant air filters with separators (typically with a temperature resistance range of 150℃-300℃, and some special models can be even higher) are widely used in industrial and special scenarios with high temperatures, high humidity or hot air flows due to their stable filtration efficiency (mostly medium to high efficiency, such as F8-H14 levels) and structural tolerance in high-temperature environments. The core is to address the “demand for air purification in high-temperature environments”. The following are its main application fields and specific scenarios, classified and sorted by industry as follows: The first major application area is the industrial manufacturing field. In this context, the core demand is dust and impurity filtration in high-temperature production processes, to protect equipment and maintain product quality. Industrial manufacturing is the primary application scenario for this type of filter, especially in processes involving high-temperature heating, baking, and smelting. It is necessary to filter out contaminants such as dust, fibers, and metal shavings in the hot air flow to prevent equipment damage or product defects. Automobile and parts manufacturing Painting workshop: The intake air filtration of high-temperature drying furnaces (such as drying after body electrophoresis and topcoat drying, with temperatures usually ranging from 120℃ to 220℃)

FFU filters (mainly referring to HEPA or ULPA high-efficiency filters) are core purification components. The timing of their replacement should be determined based on the actual usage conditions. If the filtration efficiency decreases or the resistance is too large, it will directly affect the cleaning effect and equipment energy consumption. The following are the specific methods and bases for judgment: I. Core Judgment Indicators: Resistance Change The resistance of the filter (air pressure) is the most intuitive basis for judgment, which is divided into “initial resistance” and “final resistance” : Initial resistance: The air flow resistance when the filter is brand new (determined by the type and material of the filter. Generally, the initial resistance of HEPA is about 100-200Pa, and that of ULPA is higher). Final resistance: The resistance of the filter when it reaches the designed replacement threshold, usually set at 1.5 to 2 times the initial resistance (for example, if the initial resistance is 150Pa, replacement is required when the final resistance reaches 225 to 300Pa). Operation method Regularly monitor the pressure difference before and after the filter through the built-in differential pressure gauge of the FFU (or an external differential pressure gauge). When the reading reaches

The service life of FFU is not a fixed value and is influenced by multiple factors. Generally, the reasonable service life of the entire equipment is about 5 to 10 years. However, the lifespan of core components varies, and regular maintenance or replacement is required to ensure the continuous and effective operation of the equipment. The following are the specific influencing factors and the lifespan characteristics of each component: 1. The lifespan differences of core components Fan: As the power source of FFU, its lifespan mainly depends on the quality of the motor and the frequency of use. High-quality motors (such as imported brands or high-precision DC motors) can have a lifespan of 5 to 8 years under normal operation (8 to 12 hours per day) and stable load conditions. If it operates at full load for a long time (24 hours without interruption) or the voltage is unstable, it may be shortened to 3 to 5 years. Filters (HEPA/ULPA) : These are consumables with a lifespan much shorter than that of the entire equipment. In environments with high cleanliness levels (such as cleanrooms of Class 10,000 or above), filters generally need to be replaced every 6 to 12 months.

The maintenance and upkeep of box-type filters are key to ensuring their filtration efficiency and extending their service life. Targeted measures should be taken based on the different characteristics of air and liquid types. The following are detailed maintenance and care methods I. Maintenance and Care of Air Box Filters 1. Regular inspection and cleaning Primary/Medium efficiency box-type filter Check once every 1 to 3 months to observe the dust accumulation on the surface of the filter material. If the surface of the filter material turns obviously black, accumulates too much dust, or the air pressure of the ventilation system increases significantly, it is necessary to clean or replace it in time. Compressed air can be used for reverse purging (with pressure controlled at 0.2-0.3MPa to avoid damaging the filter material), or it can be rinsed with clean water (only applicable to washable filter materials, dry after rinsing before installation, and avoid direct sunlight). Note: The primary filter can generally be cleaned 2 to 3 times, while the medium-efficiency filter is recommended to be replaced directly after cleaning 1 to 2 times to avoid clogging of the filter material and affecting the filtration effect. High-efficiency box-type filter Check every 3

Box-type filters, with their diverse types and flexible filtration capabilities, have a wide range of applications, covering two major fields: air purification and liquid filtration. Specifically, they are as follows: I. Application Scenarios of Air Box Filters Air box filters are mainly used to remove dust, particles, microorganisms (tiny living organisms such as bacteria), and other impurities from the air. Depending on how efficiently they filter particles (filtration efficiency refers to the percentage of particles removed from the air by the filter), their application scenarios have different focuses: Primary efficiency box-type filter It is suitable for primary filtration in ventilation systems. This includes the pre-treatment of fresh air in central air conditioning systems, which are found in large shopping malls, office buildings, stadiums, and other public places. It can filter out large dust particles (above 5μm, where μm means micrometers, or one-millionth of a meter) in the air and protect the subsequent medium and high-efficiency filters. Ventilation systems used in agricultural and livestock breeding sites reduce dust, hair and other substances in the air and improve the breeding environment. As a pre-filtering device for ventilation in industrial plants, such as mechanical processing workshops and storage warehouses, it reduces the amount

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