How does HEPA 13 filter work?

Intercepting mechanism – HEPA filters are subdivided into H10-14 and U15-U17 according to the current European class. The most common in air purifiers is the H grade, which is a high-efficiency or sub-high-efficiency filter, the single filter effect of H11 is 98%, H12 is 99.9%, H13 grade HEPA filter can achieve the total efficiency of 99.95%, H14 grade HEPA filter total efficiency can reach 99.995%. Its filtration mechanism includes four kinds. The first one is the interception mechanism, which works on large particles.

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Gravity influence – The second mechanism is gravity influence. Particles with small volume and high density will slow down when they pass through the HEPA filter, and will naturally settle on the HEPA. This process is somewhat similar to the process of sediment settling in the downstream of the river.

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Airflow Influence – The third mechanism of HEPA filter is airflow influence. Due to the uneven weaving of the HEPA filter, a large number of air swirls are formed, and ultra-small particles are adsorbed on the HEPA filter by the influence of this cyclone to achieve the purpose of filtration.

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Ultrafine particle filtration -Superfine particles impinged on HEPA fiber layer by Brownian motion and were purified by the influence of van der Waals force. For example, virus carriers below 0.3μm are purified under the influence of this force.

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