What is the difference between a liquid tank high-efficiency filter and an ordinary high-efficiency filter without partitions?
1. Both belong to the filter family without partitions
The liquid tank high-efficiency filter and the ordinary non-partition high-efficiency filter belong to the non-partition filter category. The core filter material of both is ultra-fine glass fiber filter paper. Both use hot melt glue lines to separate the filter materials to form a dense pleated structure. There is no essential difference in filtration mechanism and efficiency level.
The fundamental difference between the two is the frame structure and sealing method . This difference determines their respective applicable installation environment and cleanliness level requirements.
2. Comparison of core differences
Contrast Dimensions
Liquid tank high efficiency filter
Ordinary high-efficiency filter without partitions
Border structure
Frame with continuous fluid groove to accommodate sealant
Straight frame, no liquid tank structure
Sealing method
Liquid sealant is injected into the liquid tank, and the colloid flows to fill the gap after the knife edge is embedded.
A sealing strip is attached to the frame and the gap is filled by compressing and deforming the strip.
Sealing principle
The liquid glue flows and fills, and forms a continuous elastic seal after solidification.
The strip is elastically compressed and sealed by contact pressure.
Long-term sealing effect
The sealant has a stable shape after curing and has high long-term reliability.
After long-term pressure, the rubber strip may undergo compression permanent deformation and reduce its resilience.
Same size filter area
The side of the liquid tank occupies part of the frame space, and the filtering area is slightly smaller.
The frame takes up less space and the filtering area is relatively larger
Replacement operation
The old glue remains in the liquid tank and is not easy to fall off; after cleaning the liquid tank, install a new filter to replenish the glue.
The old rubber strip is removed with the filter. The aged rubber strip may shed particles.
Installation test
After installation, PAO leak testing is usually performed to verify the sealing effect.
General visual inspection is enough to ensure that the installation is in place.
price
The frame processing is complex and requires sealant, which is expensive.
Simple structure and low cost
Applicable cleanliness level
ISO level 5 (level 100) and above
ISO level 5 and below
3. Essential differences in sealing methods
The sealing strip used in ordinary high-efficiency filters without partitions is usually made of polyurethane or EPDM (ethylene propylene diene rubber). During installation, the rubber strip is compressed between the filter frame and the box mounting surface, relying on the elastic resilience of the rubber strip to form a seal. The effectiveness of this sealing method depends on three factors: the amount of compression of the strip, the material hardness of the strip, and the flatness of the mounting surface. If there are local unevenness on the installation surface, or the rubber strips are compressed and permanently deformed after long-term use, small leakage channels may be formed locally.
The sealing of the liquid tank high-efficiency filter does not rely on the elastic compression of the rubber strip. The sealant is in a liquid state when injected. After the knife edge is embedded, the colloid flows naturally under the action of gravity and knife edge extrusion, filling all the gaps between the knife edge and the liquid tank. After the colloid solidifies, it forms an elastomer and completely wraps the knife edge. Even if there are small deviations in the flatness of the mounting surface, the flow characteristics of the liquid glue automatically compensate for these irregularities, creating a continuous seal.
4. How does the difference in filter area arise?
The frame of the liquid tank high-efficiency filter has a continuous liquid tank groove, which occupies part of the width of the frame. Under the same overall dimensions, the effective installation width of the filter material of the liquid tank frame is slightly smaller than that of the ordinary straight frame. Therefore, the folding width of the filter material of the liquid tank filter is slightly smaller, and the effective filtering area is also slightly smaller.
Taking the 610×610mm specification as an example, the width of the filter material of an ordinary filter without partitions is close to 610mm, while the width of the filter material of a liquid tank filter needs to be reduced by the width occupied by the sides of the liquid tank on both sides, which is usually reduced by 20-30mm. The reduction in filtration area caused by this difference is usually between 5% and 10%. In actual selection, it can be compensated by choosing a slightly larger size.
5. Basis for selection of applicable scenarios
Scenarios for selecting a liquid tank high-efficiency filter:
Cleanliness level requires ISO level 5 (level 100) and above
Pharmaceutical GMP Class A, Class B clean area
Semiconductor chip manufacturing photolithography, etching and other key processes
Biosafety laboratory P3, P4 level
Projects that have strict requirements on frame leakage and need to pass PAO leak detection verification
Scenarios for choosing an ordinary high-efficiency filter without partitions:
Cleanliness level ISO level 5 and below
General electronic assembly, food processing clean room
Pharmaceutical Class C, Class D clean area
Projects with limited budget and non-strict sealing requirements
FFU matching occasions that have higher requirements on filter area
6. Selection considerations for two types of filters
When choosing between a liquid tank high-efficiency filter and an ordinary high-efficiency filter without partitions, it is recommended to consider the following aspects:
Cleanliness level requirements: Cleanliness level is the primary basis for judgment. It is recommended to use a liquid tank filter for clean rooms of ISO class 5 and above to ensure the sealing of the installation frame. For ISO level 6 and below, the rubber strip sealing of ordinary filters without partitions can meet the requirements.
Leak detection requirements: If the project requires PAO leak detection for each filter after installation, the liquid tank filter will have a higher pass rate. If only random inspection is required or no leak detection is required, ordinary filters without partitions are sufficient.
Replacement frequency and environment: In situations where filters need to be replaced frequently (such as environments with high particle concentrations), the replacement operation of the liquid tank filter is cleaner and the old glue is not easy to fall off. In an environment with average cleanliness requirements, the replacement operation of ordinary non-partition filters is simpler.
Cost budget: The purchase cost of liquid tank filters is higher than that of ordinary filters without partitions. If the budget is limited and the cleanliness requirements are not extremely high, ordinary filters without partitions are a more economical choice.
7. Product features of two types of filters from Aili Industry
Aili Industry produces both liquid tank high-efficiency filters and ordinary partitionless high-efficiency filters. Users can flexibly choose according to the cleanliness level and budget.
Liquid tank high-efficiency filter: Aili industrial liquid tank high-efficiency filter adopts an anodized aluminum alloy frame. The liquid tank structure has been designed and optimized to match well with the knife-edge structure of various installation boxes. Matched with polyurethane liquid tank sealant, it has good fluidity and curing characteristics. The efficiency level covers H14 and U15-U17, and is suitable for high cleanliness environments of ISO level 5 and above. Each unit is scanned and tested for leaks one by one before leaving the factory, and a test report is attached.
Ordinary non-partitioned high-efficiency filter: Aili Industrial's ordinary non-partitioned high-efficiency filter adopts an aluminum alloy or galvanized steel plate frame with a straight frame and matching polyurethane sealing strips. The efficiency levels cover H13, H14 and U15-U17, and are suitable for FFU, EFU, clean shed and other equipment. Each unit is tested for efficiency and resistance before leaving the factory, and a test report is provided.
Independent production of the entire industry chain: Aili Industry has been deeply involved in the field of purification equipment for more than 20 years, and has built a closed loop of the entire industry chain from fan research and development, control system development to high-efficiency filter production. The key components required for the filter are all independently developed, produced and tested by the company, and the quality is controllable.
If you want to know more about the selection suggestions of liquid tank high-efficiency filters and ordinary partition-less high-efficiency filters, you can contact the Aili industrial engineering technical team and provide the cleanliness level and installation conditions to obtain an adaptation plan.
HEPA installation should be carried out according to the airflow direction and installation drawing confirmed on site: first check the filter and frame, then clean the installation surface, press the seal evenly, and finally verify the air volume and seal under specified operating conditions.
When it is found that the HEPA installation direction is inconsistent with the product or box identification, the acceptance of this position should be suspended, the supplier's drawings and airflow arrows should be checked, and then adjusted according to the allowed installation method. Just because the filter fits into the frame doesn't mean the orientation is correct.
When purchasing HEPA, you should at least clarify the outer frame size, efficiency level and applicable standards, rated air volume, resistance, structure, sealing method, use environment and testing data requirements. The old filter element replacement project also requires installation frame and disassembly and assembly path information.
Differences in high-efficiency filter quotations may come from efficiency levels, filter materials, structural dimensions, resistance requirements, sealing methods, detection range and order quantity. When comparing prices, you should first confirm whether each quotation corresponds to the same technical conditions.
The installation quality of the liquid tank high-efficiency filter directly affects the sealing effect and cleanliness. Before installation, it is necessary to check that the appearance of the filter is not deformed or damaged, that the liquid tank is intact, and that the box knife edge is flat and free of burrs. During installation, pay attention to controlling the injection amount of sealant to 70%-80% of the depth of the liquid tank, and inject glue evenly and continuously along the periphery of the liquid tank. The filter must be vertically embedded in the knife edge and pushed into place; after installation, it is recommended to conduct a visual inspection, a PAO leak test and an initial resistance record. Common problems include sealant overflow (too much glue), insufficient sealant (too little glue), difficulty in pushing the filter (skew or size mismatch), and PAO leak detection frame leakage (insufficient insertion depth or missing glue). Aili industrial liquid tank high-efficiency filter is provided with polyurethane sealant and installation guidance materials, and the engineering technical team can provide installation technical guidance support.
The liquid tank high-efficiency filter and the ordinary non-partition high-efficiency filter belong to the non-partition filter category. The core difference lies in the frame structure and sealing method. The liquid tank filter frame has a liquid tank groove, and liquid sealant is injected to achieve sealing. The sealant flows and fills all irregular gaps. It has high long-term reliability and is suitable for ISO class 5 and above clean rooms. Ordinary filters without partitions are sealed by sealing tape extrusion, with a simple structure and low cost, and are suitable for ISO class 5 and below scenarios. The filtration area of the liquid tank filter of the same size is slightly smaller (about 5%-10% less), the price is higher, and the replacement operation is cleaner. When selecting, a comprehensive judgment must be made based on the cleanliness level, leak detection requirements, replacement frequency and budget. Aili Industrial produces two types of filters at the same time, with efficiency levels covering H13, H14 and U15-U17. Each unit has been tested and a test report has been issued.
The liquid tank high-efficiency filter and the ordinary non-partition high-efficiency filter belong to the non-partition filter category. The core difference lies in the frame structure and sealing method. The liquid tank filter frame has a liquid tank groove, and liquid sealant is injected to achieve sealing. The sealant flows and fills all irregular gaps. It has high long-term reliability and is suitable for ISO class 5 and above clean rooms. Ordinary filters without partitions are sealed by sealing tape extrusion, with a simple structure and low cost, and are suitable for ISO class 5 and below scenarios. The filtration area of the liquid tank filter of the same size is slightly smaller (about 5%-10% less), the price is higher, and the replacement operation is cleaner. When selecting, a comprehensive judgment must be made based on the cleanliness level, leak detection requirements, replacement frequency and budget. Aili Industrial produces two types of filters at the same time, with efficiency levels covering H13, H14 and U15-U17. Each unit has been tested and a test report has been issued.
V-type high-efficiency filter can reach H13 and H14 levels of EN1822:2009 standard. The total MPPS efficiency of H13 is ≥99.95%, and the local penetration rate is ≤0.25%; the total MPPS efficiency of H14 is ≥99.995%, and the local penetration rate is ≤0.025%. H13 is suitable for ISO7-8 clean rooms, electronic assembly, food processing and other scenarios; H14 is suitable for ISO5-6 clean rooms, pharmaceutical GMP, hospital operating rooms, semiconductor manufacturing and other key places. The V-shaped filter is designed with a V-shaped structure and can achieve large air volume carrying and controllable resistance in both H13 and H14 grades. When selecting, a comprehensive judgment must be made based on cleanliness level requirements, industry specifications and system air volume. Aili industrial V-type high-efficiency filters strictly comply with the EN1822 standard, and the efficiency levels cover H13 and H14. H14-level products are scanned and tested for leaks one by one, and test reports are provided.
The initial resistance is the pressure difference value of the new V-type high-efficiency filter under the rated air volume, in Pa, which is the basic parameter for selection, operation and maintenance. The initial resistance of V-type filter H13 grade is usually ≤200Pa, and the initial resistance of H14 grade is usually ≤250Pa. Under the same conditions, the resistance of H14 is slightly higher than H13. The initial resistance is used for fan head calculation and energy consumption assessment during selection, and is used as a basis for replacement judgment during operation - the final resistance is usually set to twice the initial resistance. When the actual measured initial resistance is high, it is necessary to check whether the actual air volume matches the rated air volume, and check whether the installation is standardized. Initial resistance is an important parameter affecting operating costs. Aili Industrial V-type high-efficiency filter is designed with low resistance. The initial resistance of H13 is ≤200Pa, and the initial resistance of H14 is ≤250Pa. Each unit has been tested for resistance and a test report has been issued.
V-type high-efficiency filters are suitable for both constant air volume (CAV) and variable air volume (VAV) HVAC systems. The air volume of the CAV system is constant and the working conditions are stable. The V-shaped filter can take advantage of low resistance and high efficiency when selected according to the designed air volume. The air volume of the VAV system is dynamically adjusted as the load changes. The V-shaped filter has a strong structure and good adaptability to wide wind speeds. The wind speed can reach 2.5m/s under the initial resistance condition of 250Pa, adapting to wind speed fluctuation conditions. When selecting the VAV system, the maximum design air volume should be used as the basis, and a 20%-30% fan pressure head margin should be reserved. It is also recommended to configure a differential pressure transmitter to monitor the resistance in real time. V-type filter efficiency grade (H13/H14) does not affect the air volume system adaptability. Aili Industrial V-type high-efficiency filter has a solid structure, rated air volume covering 2400-4200m³/h, and is suitable for CAV and VAV systems. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
The selection of large air volume V-type high-efficiency filter requires comprehensive consideration of four core parameters: rated air volume, overall size, initial resistance and efficiency level. Common specifications include rated air volume covering 850-4200m³/h, external dimensions ranging from 287×592×292mm to 1220×610×292mm, and initial resistance as low as ≤200Pa. The selection steps include calculating the total air volume of the system, determining the air volume requirement of a single unit, selecting the overall dimensions according to the parameter table, checking the installation space (especially the depth direction, the standard is 292mm), selecting the efficiency level (H13 or H14), checking the initial resistance and evaluating the replacement cycle. It is recommended to reserve 10%-20% air volume margin when selecting a model to avoid neglecting the depth size, the impact of efficiency level on air volume, and the difference between initial resistance and final resistance. Aili Industrial provides a variety of dimensions and V-shaped configurations, with rated air volume covering 850-4200m³/h. It strictly complies with the EN1822 standard. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
The V-type high-efficiency filter is arranged in a V-shape with multiple filter elements without partitions, which increases the filtration area to 3-5 times that of ordinary flat-plate filters under the same external dimensions. Its core principle is to expand the filter material from a two-dimensional plane to a three-dimensional space, making full use of the depth direction of the frame. The increased filtration area brings practical advantages such as low resistance (initial resistance can be as low as ≤200Pa), large air volume (rated air volume can reach 2400-4200m³/h), high dust holding capacity and reduced number of filters. V-type filters are suitable for large air volume scenarios in limited spaces such as the end of air-conditioning boxes, compact HVAC systems, return air ducts in clean factories, and upgrades of existing systems. When selecting the model, you need to confirm the installation depth, select the V-shaped configuration according to the air volume, and check the system resistance. Aili industrial V-type high-efficiency filters strictly comply with the EN1822 standard and are available in 3V, 4V, and 5V specifications. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
V-Bank high-efficiency filter (V-type combined high-efficiency filter) uses multiple filter elements without partitions to form a V-shaped structure. The rated air volume can reach 2400-4200m³/h. It is suitable for constant air volume (CAV) and variable air volume (VAV) HVAC systems. Typical application scenarios include hospital operating rooms and ICUs, pharmaceutical GMP workshops, electronic and semiconductor clean workshops, food processing plants, data centers, hotels and schools and other commercial buildings, as well as industrial ventilation facilities such as power plants. V-Bank filters can be used as high-efficiency filtration or ULPA pre-protection at the end of air conditioning boxes in HVAC systems. They have technical advantages such as large air volume carrying capacity, low operating resistance, high dust holding capacity, and saving installation space. Aili Industrial V-Bank high-efficiency filters strictly comply with EN1822 standards, with efficiency levels covering H13 and H14, adapting to the needs of various HVAC air treatment systems. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
The V-type partitionless high-efficiency filter uses multiple partition-less filter elements to form a V-shaped structure. The filtration area can reach 3-5 times that of ordinary filters, the rated air volume can reach 2400-4200m³/h, and the initial resistance can be as low as ≤200Pa. In large air volume systems, compared with ordinary high-efficiency filters, V-type filters have the advantages of reducing the number of filters, saving installation space, reducing installation costs, reducing operating energy consumption, and extending the replacement cycle. The efficiency level covers H13 and H14, and is suitable for large air volume scenarios such as terminal filtration of air-conditioning boxes, electronic semiconductors, pharmaceuticals and medical care, and power plants. When selecting, you need to pay attention to parameters such as rated air volume, initial resistance, efficiency level, and overall dimensions. Aili Industrial V-type partitionless high-efficiency filter strictly complies with the EN1822 standard and provides large air volume design, low resistance and high dust holding capacity, optional multi-material frames and unit-by-unit inspection services.
The V-type high-efficiency filter (V-Bank) uses multiple filter elements without partitions to form a V-shaped structure. The filtration area can reach 3-5 times that of ordinary filters. The designed air volume is more than 2 times higher than that of high-efficiency filters with partitions. The initial resistance can be as low as ≤200Pa. Compared with ordinary high-efficiency filters, V-type filters require fewer installations, smaller installation space, lower operating resistance, higher dust holding capacity and longer service life under the same air volume. The efficiency level covers H13 and H14, and is mainly used in scenarios such as terminal filtration of air-conditioning boxes, large air volume HVAC systems, electronic semiconductors, pharmaceuticals, medical and power plants. Aili industrial V-type high-efficiency filters strictly comply with the EN1822 standard, provide multiple specifications and are tested one by one, and support customized production.
The thickness (50mm, 70mm, 90mm, 120mm) and filter area of the high-efficiency filter without partitions directly affect the air volume carrying capacity, initial pressure difference, dust holding capacity and service life. 70mm is the standard configuration of FFU, which strikes a balance between space occupation and performance; 90mm and 120mm are suitable for equipment with ample space such as air-conditioning boxes, with larger filter area and longer replacement cycle. When selecting, a comprehensive judgment must be made based on the size of the installation space, system air volume, fan head margin and full life cycle cost. If space allows, choosing a thicker filter, lower energy consumption and longer replacement intervals can usually pay back the cost difference within 1-2 years. Aili Industrial provides multiple thickness specifications of 50-120mm and non-standard customization services. Each unit is scanned and tested for leaks one by one and a test report is issued. The engineering and technical team can assist in air volume calculation and resistance calculation.
The partition-less high-efficiency filter uses ultra-fine glass fiber filter paper and hot-melt adhesive line separation technology, and can cover the full range of efficiency levels of H13, H14 and ULPA U15, U16, and U17. According to the EN1822 standard, H13 efficiency ≥ 99.95%, H14 ≥ 99.995%, U15 ≥ 99.9995%, U16 ≥ 99.99995%, U17 ≥ 99.999995%. Different levels correspond to different cleanliness requirements - H13 is suitable for ISO 7-8 clean rooms, H14 is suitable for ISO 5-6 clean rooms, and the local penetration rates of H13 and H14 differ by ten times. ULPA conducts efficiency assessments in the particle size range of 0.1-0.2μm and is suitable for high cleanliness environments of ISO level 4 and above. When selecting a model, a comprehensive balance must be made based on the cleanliness level, industry standards, system air volume and budget. Aili Industrial has independent production capabilities throughout the industry chain and strictly follows the EN1822 standard. Each filter is scanned and tested for leaks one by one and a test report is provided. It supports full series customization of H13, H14 and U15-U17.
When the installation space of FFU, EFU, clean shed or other clean equipment is limited, high-efficiency filters without partitions can be considered. The partition-less structure uses glue lines to fix the fold distance of the filter material, and has a certain design space in terms of filter thickness, filter area and internal structure. The actual selection should not only focus on the thickness of the filter, but also need to comprehensively consider the filtration efficiency, target air volume, initial resistance, fan static pressure, sealing method and later replacement space. Aili Industry can match the specifications of high-efficiency filters without partitions based on the equipment installation dimensions and operating parameters.
Partitionless high-efficiency filters can be used in clean environments such as semiconductors, electronic manufacturing, photovoltaics, pharmaceuticals, laboratories and precision manufacturing according to different specifications, and are often used in conjunction with FFU, EFU, clean sheds and clean room terminal air supply equipment. Different applications have different requirements for filtration efficiency, air volume, resistance, size, thickness and sealing methods, so selection needs to be based on specific equipment and clean environments. Aili Industry can match the specifications of high-efficiency filters without partitions based on industry applications, equipment structures and project parameters.
High-efficiency filters without partitions usually adopt filter material folding, glue line separation and outer frame sealing structure, without using traditional paper partitions or aluminum partitions. Its specifications mainly include overall dimensions, thickness, filtration efficiency, air volume, initial resistance, outer frame material and sealing method, etc. When used in FFU, EFU, clean sheds and clean room terminal air supply equipment, it needs to be matched based on the installation space, fan performance and target air volume. Aili Industry can provide corresponding specifications and configurations of high-efficiency filters without partitions based on equipment size, air volume, filtration efficiency and usage environment.
Aili Industrial develops and manufactures
FFU, EFU, HEPA/ULPA air filters, high-efficiency air supply vents, fan boxes and other clean air equipment. Relying on motors, fans, control systems, filters and complete machine supporting capabilities, we provide selection and customization support for clean room and production equipment projects.
