Air filter is a kind of equipment that captures dust and pollutants in the air through porous filter materials, which is used to purify the air and ensure the cleanliness requirements of a specific environment. Air filters play an important role in modern industry, medical treatment and daily life, with various types and different functions. All kinds of air filters, from initial effect to high efficiency, have a wide range of applications and unique functions in different fields. The following will introduce the types and characteristics of air filters:
1. Primary air filter
(1) Structure and material
The primary effect filter is generally made of non-woven fabric, metal mesh, nylon mesh and other materials, which has large pores and can capture larger particles of dust.
(2) Main functions
It is mainly used for the primary filtration of air conditioning and ventilation systems, or as the pre-filtration of more efficient filters to protect the service life of subsequent filters. It is often used to filter dust particles of 5 microns and above, and is suitable for air conditioning purification system as a pre-filter.
2. Medium efficiency air filter
(1) Structure and material
The medium effect filter is generally made of a combination of man-made fiber and galvanized iron, and the filter material mainly includes glass fiber, medium cell polyethylene foam and synthetic fiber felt.
(2) Main functions
It is mainly used for intermediate filtration of air conditioning system, which can effectively reduce the burden of high efficiency filter. Common filtration efficiencies include 40-45%, 60-65%, 80-85%, and 90-95%.
3. High efficiency air filter
(1) Structure and material
Hepa filters usually use ultrafine glass fiber filter paper as filter material, and the pores are very small, which can filter out extremely fine dust particles.
(2) Main functions
It is mainly used for air purification under normal temperature and humidity conditions, widely used in aerospace, aviation, electronics, pharmaceutical and other fields, and has extremely high filtration efficiency for 0.3 micron dust particles.
4. Sub-high efficiency air filter
(1) Structure and material
The sub-high efficiency filter is between the high efficiency and the medium efficiency filter, and the filter material is mainly glass fiber or synthetic fiber.
(2) Main functions
It is mainly used for the terminal filtration in the lower level purification system, or as the pre-stage filtration of the high efficiency filter to improve the overall filtration efficiency.
5. Activated carbon air filter
(1) Structure and material
Activated carbon filter with high adsorption activated carbon as filter material, mainly used to remove odor in the air, volatile organic compounds.
(2) Main functions
Widely used in food processing plants, hospitals and other environments that need to remove odors and harmful gases, with good purification effect and low resistance.
6. High temperature high efficiency filter
(1) Structure and material
This type of filter is specially designed to withstand high temperature environments, and the filter material is usually specially treated glass fiber or other high temperature materials.
(2) Main functions
Suitable for air purification in high temperature environment, such as pharmaceutical, electronic manufacturing and other industries, can filter out small dust particles and maintain structural stability.
7. High efficiency filter without partition
(1) Structure and material
The clapless filter eliminates the traditional clapless design, optimizes the airflow passage, improves filtration efficiency and reduces drag.
(2) Main functions
It is mainly used in applications requiring efficient filtration and low resistance, such as dust-free workshops, laboratories, etc., effectively extending service life and reducing energy consumption.
8. Bag medium effect filter
(1) Structure and material
The primary and middle effect non-woven fabric is used as filter material, and the frame is usually cold plate spray material, which has large dust capacity and low resistance.
(2) Main functions
Mainly used for first and second level filtration, widely used in commercial buildings, hospitals and other places, can be cleaned to extend the service life.