How little resistance does an ultra low impedance medium efficiency filter have?

The ultra-low resistance and high efficiency air filter is actually one of the air filters, the difference is that the resistance of ordinary air filters is high when the efficiency is high, and the application in the air conditioning system is often limited by the lack of fan pressure head, especially the air conditioning system form of fan coil unit and fresh air, so the development of low resistance and high efficiency air filter has become an urgent problem to be solved. After years of research, Xu Zhonglin, a researcher at China Academy of Building Research, has developed a number of patented products such as ultra-low-resistance high-efficiency air filters, ultra-low-resistance energy-saving high-efficiency purification new (return) air units, etc., which have been widely used in hospitals, clean workshops, laboratories and other fields.

As the "Eleventh Five-Year Plan" national science and technology support project "Research on Key Technologies for Biological Pollution Control and Improvement in Building Interior", the results of more than a year of operation practice have shown that its performance is excellent, and it can effectively reduce indoor pollution while not affecting the air volume of the air conditioning system. The project was tested and identified by the air-conditioning environmental testing department, and compared with the indoor air-conditioning environment without ultra-low impedance and high-efficiency air filters, and the relevant testing data were given, in order to provide some useful references for the design and construction of the air-conditioning system of the hospital building.

Air filtration is a purification method that allows air to pass through a fiber filter material to capture particulate pollutants in the air. Air filtration can filter not only particulate pollutants but also bacteria and viruses, because microorganisms such as bacteria and viruses cannot exist alone in the air and are often found on the surface of dust particles that are several times larger than them. The filtration effect of the HEPA filter is conclusive, and it is 1 3 orders of magnitude larger than that of filtering o 5 bucket m particles, because the equivalent diameter of microbial particles is about 1-5 m.

Professor Tu Guangbei concluded that there is a good linear correlation between the filtration efficiency of the fiber for atmospheric bacteria and its counting efficiency for 5 buckets of atmospheric dust, and the filtration efficiency of atmospheric bacteria can be approximately regarded as the counting efficiency of 5 buckets of atmospheric dust.

The parameters of the ultra-low impedance and high efficiency air filter are explained, and the filtration efficiency of the ultra-low impedance and high efficiency air filter is described in the table of filtration efficiency of the ultra-low impedance and high efficiency air filter and the above analysis, which can effectively reduce indoor microbial pollution. The relationship curve between the resistance and air volume of the I-type ultra-low resistance medium and high efficiency air filter (500ram 400ram 60mm) is shown in the "Relationship Curve Graph of Resistance and Air Volume of Ultra Low Resistance and High Medium Efficiency Air Filter". It can be seen from the "ultra-low resistance high and medium efficiency air filter resistance and air volume relationship curve", the resistance of the filter is basically linear with the air volume, and the resistance of the ultra-low resistance and high efficiency air filter is 700m3 hn, and the resistance is less than 20pa, which can be widely used in fan coil unit systems with residual pressure of 50pa or even 30pa.

What is the initial resistance of the intermediate filter?

The initial resistance of the intermediate filter actually refers to the resistance measured by the new intermediate filter that has just left the factory, of course, this test needs to be detected under the special tester, which cannot be obtained through simple calculation, we all know that the intermediate filter is mainly divided into five kinds according to efficiency: F5, F6, F7, F8, F9.

F5 intermediate filter initial resistance: 70-80pa

F6 intermediate filter initial resistance: 80-90Pa

F7 medium filter initial resistance: 90-100pa

F8 medium filter initial resistance: 100-110Pa

F9 intermediate filter initial resistance: 110-120pa

The initial resistance of the intermediate filter is much larger than that of the primary filter, so when selecting the air filter, it should be noted that the selection is based on the initial resistance.

The above is "How little resistance is the ultra-low impedance medium efficiency filter?" If you have any questions, you can consult Anhui people and purification.

The high-efficiency air filter is mainly used to capture the following particles, dust and various suspended solids. The raw materials for the production of high-efficiency air filters are mainly made of ultra-fine glass fiber paper as filter material, offset paper, aluminum film and other materials as dividing boards, which are glued together with wooden frame aluminum alloy. Each unit has been tested by the nano-flame method, which has the characteristics of high filtration efficiency, low resistance and large dust holding capacity.

HEPA filters can be widely used in the air supply at the end of the air conditioner in the dust-free purification workshop of optical electronics, LCD liquid crystal manufacturing, biomedicine, precision instruments, beverage and food, PCB printing and other industries. HEPA filters and ultra-high efficiency filters are used at the end of clean rooms and various purification equipment, and their structural forms can be divided into: high-efficiency filters with partitions, high-efficiency filters without partitions, high-efficiency filters with large air volume, ultra-high-efficiency filters, etc., the difference between high-efficiency filters with partitions and high-efficiency filters without partitions lies in the production process and the practice of partitions.

The similarities and differences between high-efficiency filters with partitions and high-efficiency filters without partitions.

HEPA filters can be divided into: high-efficiency air filters with partitions and high-efficiency air filters without partitions.

The high-efficiency filter with partition is made of ultra-fine glass fiber as filter material, glue paper, aluminum and platinum as separator, and glued with wooden frame or aluminum alloy frame, which has the advantages of high filtration efficiency, low resistance and large air volume, and is widely used in various local purification equipment and clean workshops.

The high-efficiency filter without partition is made of ultra-fine glass fiber as the filter material, and the hot-melt adhesive is used as the separator, which is assembled with various outer frames, and the outer frame is beautiful, compared with the high-efficiency filter with partition, under the same air volume, it has the advantages of small size, light weight, compact structure and reliable performance.

There are actual and nominal sizes of partition HEPA filters and no partition HEPA filters.

The reason why there is a distinction between actual size and nominal size of high-efficiency filter with or without partition is because the nominal size is the filter that includes the outer frame and filter material, and the actual size is generally removed from the outer frame, and only the width, height, depth and area of the filter material are calculated.

Standard folds, fold heights, and formula conversions for both diaphragm-high efficiency and non-diaphragm-high efficiency filter media.

The folding height of the filter paper with the partition high-efficiency air filter is generally shorter than the height of the nominal size of 30mm 34mm, the fold is mainly determined by the tightness of the partition paper and the filter paper and the partition paper assembly, the arc of the partition paper is calculated according to the standard, generally 4mm, less than 4mm, then the number of partitions with the partition is more, in addition, the loose of the japonica assembly is determined to be reversed, the number of partitions with partitions is less, and the number of filter paper without partitions is mainly folded by the filter paper, and the tightness of the filter paper.