How are air filter ratings classified?

Full range of compressed air filters: Accuracy class:

c：3μt：1μa：

Air filters come in a variety of weights and are classified in different ways.

According to the form of the institution: single-level, two-level and multi-level;

According to the degree of filtration: coarse filtration, fine filtration;

According to the filtration method: filter type and bath type;

According to the material and processing method: PU (air filter), PP (injection air filter), environmentally friendly air filter),

PT (Iron Cover Air Filter).

According to the viscosity of the filter material: dry and wet filtration and wet filtration.

Generally, the oral is divided according to different materials: PU, PP, environmental protection, and PT.

There are two types of air cleaners, dry and wet. A dry air filter is a filter that separates impurities from the air through a dry filter, such as a paper filter. The air filters used in light vehicles (including cars and mini vehicles) are generally single-stage.

It is available in oblate or oval shapes and flat plates. The filter material is filter paper or nonwoven. The end cap of the filter element is made of metal or polyurethane, and the housing material is metal or plastic.

Abstract:There are four types of air filters: coarse, medium-high-efficiency, sub-high-efficiency-high efficiency and ultra-high efficiency, in fact, this is also divided according to the grade of the air filter, and the grade of the air filter refers to the classification of the filter due to the different filtration effects of different filters. Next, this article will briefly introduce what are the types of air filters and what the level of air filters means, and I will take a look at it in the article!

1. What are the types of air filters?

Air filters are divided into four types: coarse efficiency, medium efficiency-medium high efficiency, sub-high efficiency-high efficiency and ultra-high efficiency, among which the European standard F7-F8 is called high and medium efficiency filters; The F9-H11 is referred to as the sub-high efficiency filter, the H12-H14 is referred to as the high-efficiency filter, and the U15 U17 is referred to as the ultra-high efficiency filter.

According to the amount of airflow, different numbers of air filters are installed in a pipe, and the filter section is installed in the centralized air conditioning system to filter out the dust particles sent into the indoor air. In order to achieve the high quality of indoor air.

2. What does the air filter grade mean?

The grade of the air filter refers to the classification of the filter due to the different filtration effects of different filters. For example, the filtration level is: H11-H14, U15, U16 (EN1882).

The higher the filter level, the better the single purification effect. The single filtration effect of H11 is 98%, H12 is, H13 is.

Usually the high-end air purifiers we generally use are HEPA nets above the H13 level. The effective filtration rate of the pair is as high as. High-end brands on the market use H13 level HEPA nets.

Other low-end products generally use H11 and H12 filters.

The higher the level of the air filter, the greater the resistance, then the energy consumption and noise will be relatively increased. Therefore, there is no need to blindly pursue too high filtration efficiency. Finding a balance is the best way to filter the air.

But if this is the case, the purified air is introduced from the outside, and the indoor has high requirements for the environment, such as the sterile room of the hospital, then at this time, the higher the grade, the better. Because the requirement at this time is not how much air you can purify in an hour, but the air you give me in must be the cleanest.

There are generally two types of air filters: paper and shakushu oil bath type. Paper filters have been widely used because of their high filtration efficiency, light weight, low cost, and convenient maintenance. The filtration efficiency of the paper filter is as high as above, and the filtration efficiency of the oil bath filter is 95 to 96% under normal conditions.

The air filters widely used in cars are paper filters, which are divided into dry and wet. In the case of dry filters, once immersed in oil or water, the filtration resistance increases dramatically, so it is important not to come into contact with water or oil during cleaning, otherwise it must be replaced with a new part.

When the engine is running, the air intake is intermittent, which causes the air in the air filter housing to vibrate, and if the air pressure fluctuates too much, it can sometimes affect the intake air of the engine. In addition, the air intake noise will also increase. In order to suppress the intake noise, the volume of the air filter housing can be increased, and some partitions can be arranged in it to reduce resonance.

There are two types of air filters: dry and wet. The dry filter cartridge is made of filter paper or non-woven fabric. In order to increase the area where air can pass through, most of the filters are machined with many small folds.

When the filter element is slightly fouled, it can be blown clean with compressed air, and when the filter element is seriously fouled, it should be replaced with a new element in time.

The wet filter cartridge is made of sponge-like trace polyurethane material, and some engine oil should be added dropwise and kneaded by hand to adsorb foreign matter in the air. If the filter is soiled, it can be cleaned with cleaning oil, and if it is excessively fouled, it should be replaced with a new one.

If the filter element is severely blocked, it will increase the intake resistance and reduce the engine power. At the same time, due to the increase of air resistance, it will also increase the amount of gasoline sucked, resulting in an over-concentrated mixing ratio, which will make the engine run badly, increase fuel consumption, and also easily produce carbon deposits. It should be a habit to check the air filter element frequently.

Millions of car purchase subsidies.

Answer] :(1) Primary Efficiency Air Filter Function: Collect large particles of dust and various suspended solids above 5 m.

Form: pleated type, plate type and bag type. Filter Material:

Special non-woven fabrics. Efficiency: 20 to 80 (gravimetric method for the capture rate of particles of 5 m).

It is often used for pre-filtration before intermediate filters. (2) Secondary efficiency air filter Function: Capture 1-5 m dust particles.

Form: deed type and bag type. Filter Material:

Special non-woven fabrics or fiberglass. Efficiency: 20 70 (colorimetric method for particles of 1-5 m).

3) High efficiency particle air filterhepa Function: Capture fine particles from 0 1 to 0 5 m. Type:

Foldable. Filter material: ultra-fine mu rock code glass fiber.

Efficiency: 99 999 (0 3 m).

Primary Efficiency Airfilter Function: Capture large particles of dust and various suspended solids above 5 m. Form:

There are three types of pleated type, plate type and bag type. Filter material: special non-woven fabric.

Efficiency: 20 to 80 (gravimetric method for the capture rate of particles of 5 m). It is often used for pre-filtration before intermediate filters.

(2) Secondary efficiency air filter Function: Capture 1-5 m dust particles. Form:

Deed and bag. Filter material: special non-jujube pat spinning fabric or glass fiber.

Efficiency: 20 70 (colorimetric method for particles of 1-5 m). (3) High-efficiency filter (HEPA) function:

Capture fine particles from 0 1 to 0 5 m. Type: Folding.

Filter material: ultra-fine glass fiber. Efficiency:

99．999％(0．3μm)。

<> refers to the maximum diameter of the impurity particles that are allowed to pass through. The key to influencing the filtration accuracy is the filter element, which can be selected according to the needs of the later components to achieve the corresponding filtration accuracy.

Flow characteristics refer to the relationship curve between the air flow through the passenger filter and the pressure drop at both ends of the over-matched ballast filter under a certain inlet pressure. In air filters, it is mainly the body and the filter element that affect the flow characteristics.

Water separation efficiency refers to the ratio of the separated moisture to the moisture contained in the air intake. Generally, the water separation efficiency of the air filter is not less than 80%.The main factor that affects the efficiency of water separation is the deflector.

The filtration rating of a water purifier is usually divided according to its ability to remove different types of pollutants. Here are five key answers to the filtration level of water purifiers:

1.Particulate matter filtration: The first stage of filtration of water purifiers is usually for the filtration of larger particulate matter, such as sediment, suspended solids, etc. This level of filter can effectively remove suspended solids from the water and improve the clarity of the water.

2.Fine filtration: The next level of filtration removes smaller particulate matter such as microorganisms and organics such as bacteria, viruses, algae, etc. These filters typically use fiber or membrane technology to effectively purify the water from microscopic contaminants.

3.Chemical removal: Some water purifiers will add an additional filter layer to remove chemicals from the water, such as residual chlorine, heavy metals, drug residues, etc. This type of filtration typically uses activated carbon or adsorbents to absorb and remove harmful chemicals from the water.

4.Desalination filtration: Some water purifiers are specifically designed to remove dissolved salts from water, such as desalination water purifiers. These water purifiers usually use reverse osmosis or ion-exchange technology, which can effectively reduce the salt concentration in the water.

5.Filter life and performance: The filter life and performance of different water purifiers are also important considerations for dividing the filtration level. High-grade water purifiers typically have longer cartridge life and higher filtration efficiency, providing cleaner, safer drinking water.

Summary: The filtration levels of water purifiers include particulate matter filtration, fine filtration, chemical removal, desalination filtration, and filter life and performance. Different filtration levels remove different types of contaminants, providing a cleaner, safer source of water.

Generally speaking, the filtration level of water purifiers can be divided into three categories:

1.Raw water filtration: This type of filter is mainly used to remove suspended solids, organic matter, heavy metal ions, bacteria, viruses, etc. in the water to achieve the purpose of purifying water quality.

2.Reclaimed water filtration: This type of filter is mainly used to remove pollutants in water, such as chlorine, fluorine, sulfate, etc., to achieve the purpose of purifying water quality.

3.Pure dry acorn source water filtration: This type of filter is mainly used to remove harmful substances in water, such as heavy metal ions, bacteria, viruses such as banquets, organic matter, etc., in order to achieve the purpose of purifying water quality.

1.According to the filtration level, the air filter is divided into: primary air filter, intermediate air filter, and high-efficiency air filter;

2.The primary air filter is generally used for dust removal filtration treatment, high-temperature oven in automobile painting factory; Medium air filters are generally used in air conditioning and centralized ventilation systems; HEPA filters are generally used in clean engineering in various industries, as well as air conditioning and process air supply systems with special requirements.

Air filters are divided into primary filters, intermediate filters, and high-efficiency filters according to the efficiency of filtration.

Filter Classification:

Pre-filter. The pre-filter, also known as the primary filter, is the first layer of purifier filtration, which can filter out large particles of dust and suspended solids in the air, and dust, hair and other substances can also be blocked by it. The pre-filter also protects the other filters.

2.Activated carbon filter.

The activated carbon filter can effectively remove odors and peculiar smells in the air, and can effectively adsorb and purify harmful gases such as second-hand smoke, formaldehyde, benzene, carbon monoxide and so on in the air. The better the activated carbon filter, the more powerful the purification function.

The HEPA filter is a high-efficiency filter, which is made of very fine organic fibers interwoven with high purification efficiency. It can efficiently filter and purify more than 70 kinds of pollutants such as bacteria, viruses, fungi, pollen, asbestos and other suspended bacteria in the air, and the particle purification rate for microns is as follows.

Knowledge: HEPA filters are subdivided into G1-G4, F5-F9, H10-H14 and U15-U17 according to the current European grades. A common one in the field of air purifiers is the H rating, where H13-14 is recognized as the best filter.

First Sticker Note: 1. Above microns, the interception effect is dominant; Below microns, the interception effect is dominant. Micron is aerodynamically challenging for the adsorption capacity of the filter, so it is used as the test standard for most filters that use adsorption to treat small particles.

2. High-level filters are often used in environments that require high reliability. However, the air volume of a machine, the filtration level, and the filter screen can be balanced, and it is not recommended to pursue a special parameter excessively, otherwise the gains often outweigh the losses, and the air purifier at any time competes for comprehensive performance!

Before reading the text, what you need to know is that the core of the filter is to pick the level, if it is not clearly marked, you have the right to request to directly call ** to the manufacturer to ask for this data. Be sure to learn more about whether the HEPA has a filtration rating of at least H11. Now the purifiers of many black-hearted businesses have a filter level of only H10, and even the actual measurement is less than H10, and many purifiers are actually electric fans!

If you are in a very polluted area, it is recommended to buy a machine with an H13 filter, if you want to use an H11 machine, such as Xiaomi's H11 filter, it is recommended to replace it in two months. If your machine uses a high-grade filter, you can extend the replacement interval appropriately to avoid waste. If your machine uses a fiberglass filter, such as the iQAIR, the replacement interval can be more than a year.

It sounds like there are many advantages of glass fiber filters, so why haven't glass fiber filters become mainstream? In fact, the cost of the glass fiber filter is much lower than that of the PP sprayed civil HEPA filter, and the reliability is also higher than that of the PP filter, but it has a very fatal shortcoming

1. The wind resistance is too large, and a very strong motor is needed to push it 2. The noise caused by the high wind resistance and high power motor 3. In order to reduce the wind resistance, the volume of the filter must be made very large, so the volume problem is not easy to solve.

Tutu Teng Air data shows that IQAIR, Amway, and Yuanda Fresh Air all use ULPA for filtration, which is a typical representative of violent filtration. Some of the FFU used in the factory at home is also the same filter paper. But they will also have higher noise at maximum power, but the benefit is that the performance is stable.

The number of words is limited, the explanation is incomplete, and the content part comes from the Tutu Teng air science popularization part, so like it if it's useful