HEPA Filter
A HEPA filter is a high-efficiency air filter that captures tiny particles such as dust, pollen, and viruses. It works by removing harmful substances from the air through interception, adsorption and capture.
The filtration effect of a HEPA filter depends mainly on the efficiency of its filter and the size of the filter's aperture. the higher the efficiency rating of a HEPA filter, the smaller the aperture of the filter, the smaller the diameter of the particles that can be captured, and the better the purification effect will be.
The efficiency rating of HEPA is divided according to the filtration effect of the filter, which is mainly divided into the following levels:
HEPA: The minimum filtration efficiency is 80%, capable of filtering particles above 0.3 microns.
H14 grade (High-Efficiency HEPA): a common filtration grade for industrial applications, removing approximately 99.97% of particles with a diameter of fewer than 0.1 microns, including bacteria, viruses, allergens, etc.
N95 grade (US standard): can filter out particles with a diameter of about 0.3 microns, including bacteria, viruses, etc. This level of masks is widely used in medical and epidemic prevention fields.
E14 level (European standard): it can remove about 99.9% of particles with a diameter of less than 1 micron, and is a commonly used air filtration standard in some European countries.
It should be noted that the efficiency level of HEPA filters produced by different manufacturers may vary, and the specific filtration effect should also refer to the product description and test report. In addition, the efficiency level of HEPA filters will also be affected by the use of the environment, maintenance and other factors.
In addition, HEPA filters have a high dust-holding capacity and can maintain efficient operation for a long time. In the process of use, HEPA filters will accumulate a certain amount of dust, which needs to be cleaned or replaced in time to ensure its purification effect.
Carbon filter
The carbon filter is a kind of air filter using activated carbon, whose main function is to adsorb and remove harmful gases and odours in the air, such as formaldehyde and benzene.
Activated carbon has a strong adsorption capacity to capture and lock these harmful substances, thus purifying the air. At the same time, the carbon filter also has a certain antibacterial effect, for some bacteria and mould also have a certain inhibition and removal effect.
The working principle of a carbon filter is mainly through the adsorption effect of activated carbon, the harmful substances in the air will be absorbed and locked, to purify the air. Its effect is affected by the quality and quantity of activated carbon, and the use of high-quality activated carbon and regular replacement can ensure the long-term stability of the carbon filter.
Carbon filters are suitable for occasions where harmful gases and odours need to be removed, such as homes, offices and public places. Its relatively low price and low cost of use and maintenance make it an affordable choice for air purification.
Combined application of HEPA and carbon filtersWhen HEPA filters and carbon filters are used in combination, they can utilise their respective advantages to achieve a more comprehensive air purification effect.
Firstly, the high-efficiency filtration performance of HEPA filters can capture and filter out fine particles and large particulate matter in the air, providing a good adsorption environment for carbon filters.
Secondly, the adsorption performance of the carbon filter can further remove harmful gases and odours in the air, such as formaldehyde and benzene, providing fresher air for the indoor environment.
Meanwhile, as HEPA and carbon filters work on different principles, they can complement each other to improve the effect of air purification. For example, some small particles that are difficult to filter by HEPA may be captured by carbon filters, while some harmful gases and odours that are not easily captured by HEPA can be removed by the adsorption effect of carbon filters.
Therefore, the combined use of HEPA and carbon filters can purify the air more comprehensively and is suitable for occasions with high requirements on air quality, such as hospitals, laboratories and precision manufacturing workshops. In the process of use, attention needs to be paid to regular cleaning or replacement of the filter to ensure its purification effect.
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