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How Does a HEPA Filter Work?
2023-10-26 18:33:12
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HEPA filters capture particles through four mechanisms: interception, gravitational settling, airflow vortices, and van der Waals forces.
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1. Interception works much like a sieve. Large particles measuring about 5 or 10 µm are intercepted and trapped.
2. Small, dense dust particles slow down as they pass through the HEPA filter and settle naturally on the filter under the influence of gravity, much like sediment settling on a riverbed.
3. The irregular arrangement of the filter fibers creates numerous air vortices. Small particles are carried by these currents and become attached to the HEPA filter.
4. Ultrafine particles move by Brownian motion, collide with the HEPA fiber layer, and are captured under the influence of van der Waals forces. Virus-carrying particles smaller than 0.3 µm can be captured through this mechanism.
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©2026 Kelan Filtration Technology(Beijing) Group Co., Ltd. All rights reserved
Record Number: Jing ICP No. 2022016037-2
Technical Support: Suyuan Network
Sales Phone/WeChat: 15601000090
Purchasing Management/WeChat: 13331060986
Company Phone: 010-60770969
Address: Room 1708, Building B, Jinyu International Center, Longyu East 1st Road, Huilongguan Street, Changping District, Beijing
©2026 Copyright Beijing Kelan Fresh Air Technology Co., Ltd. All rights reserved
Record Number: Jing ICP No. 2022016037-2
Technical Support: Suyuan Network
