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What materials are air filters made of, and how should you choose one?
Release Date:
2021-04-29
The primary function of an air purifier is to filter out various airborne pollutants and pathogens, thereby providing people with a healthy breathing environment. When purchasing an air purifier, consumers are most concerned about its purification performance.
The primary function of an air purifier is to filter out various airborne pollutants and pathogens, thereby providing people with a healthy breathing environment. When purchasing an air purifier, consumers are most concerned about its purification performance.
However, the one used Air filter The clean production of air purifiers differs significantly from filtration technology. Generally, air purifiers can be classified into purely physical air purifiers and non-physical air purifiers based on the operating principles of their air filters. A purely physical air purifier is one that relies entirely on no filter media—such as HEPA or activated carbon—to capture airborne pollutants; instead, it achieves purification through physical means alone. In contrast, non-physical air purifiers employ materials like negative-ion filters, photocatalytic filters, and electrostatic dust-collection filters to release purification and sterilization agents into the surrounding air, thereby cleaning and disinfecting the indoor environment.
Negative-ion filter: A negative-ion air filter uses the negative ions it generates to purify mold, remove dust and odors, and improve the indoor environment. At its core is the negative ion, which leverages its dust-collecting, antibacterial, and detoxifying properties to enhance indoor air quality; however, this approach can result in incomplete purification and a higher risk of secondary pollution.
Photocatalytic filter: This filter effectively degrades toxic and harmful substances, kills various bacteria, and also offers deodorizing and anti-fouling functions. However, ultraviolet light is essential for the photocatalytic process. Air filter the conditions that trigger it; therefore, no one should be present while such air purifiers are operating.
Electrostatic dust-collection filter: This is a convenient, maintenance-free air-filter consumable that comes at a high price. However, if the filter becomes excessively clogged with dust or its electrostatic dust-collection efficiency declines, it can easily cause secondary pollution in the surrounding space.
Activated carbon filter: effectively removes odors and dust without causing secondary pollution; however, once the adsorption capacity is saturated, the filter must be replaced, with a service life of about 3–4 months. Of course, some brands use higher-quality activated carbon, which can improve its efficiency and extend its effective lifespan.
HEPA filter: a higher-efficiency filtration medium that is internationally recognized as the best high-efficiency filter material, capable of efficiently capturing 94% of particles larger than 0.3 microns in the air. However, it has relatively high consumable costs, requires a fan to drive airflow, and tends to generate significant noise. Its main limitation is that it cannot effectively filter inhalable particulate matter with diameters smaller than 3 microns.
If you are choosing Air filter When used in combination, filters made from different materials can complement each other’s strengths, resulting in superior filtration performance compared with single-material air filters.
Keywords:
Air filter
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