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Can Filters Capture Particles Smaller Than Their Pores? Understanding Interception
Direct interception captures particles smaller than the gaps between filter fibers when their airflow path brings them into contact with a fiber surface.
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[Standards News] Revision of QB/T 5365 for Air-Purifier Filters Officially Launched
On January 14, 2025, industry representatives met in Hefei to launch the revision of QB/T 5365, the standard for filter-type air-purifier filters.
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What Do Pre-, Medium-, and High-Efficiency Filters Do?
A three-stage system uses pre-filters for large debris, medium-efficiency filters for intermediate particles, and HEPA filters for fine pollutants.
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What Should You Know About Air Filters in Humid Environments?
Humidity can reduce filtration efficiency, accelerate activated-carbon saturation, and promote microbial growth. Learn how to select, maintain, and replace filters in damp spaces.
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Separator vs. Separatorless HEPA Filters: How Structure Affects Leakage and Airflow Resistance
Separator and separatorless HEPA filters differ in support design, sealing, media area, and airflow-channel consistency—factors that shape leakage risk and pressure-drop uniformity.
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How Temperature and Relative Humidity Affect Air Filter Media Such as Electrets and Activated Carbon
Temperature and humidity affect electret charge stability and activated-carbon adsorption, reducing particle and VOC removal under hot, humid conditions.
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How Matching Pre-Filter and Medium-Efficiency Filter Airflow Extends HEPA Filter Life
Correctly matching airflow across pre-, medium-, and high-efficiency filters lets upstream stages share the particle load, reducing HEPA clogging and extending service life.
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Effect of 50 vs. 100 Pleats in Bag Dust Filters on Dust-Holding Capacity, Resistance, and Filtration Efficiency
Compare how 50 versus 100 pleats per meter affect filter area, dust capacity, pressure drop, particle efficiency, and airflow distribution.
![[Standards News] Revision of QB/T 5365 for Air-Purifier Filters Officially Launched](http://img.wds168.cn/comdata/73497/202507/20250726170312c3b658.png "[Standards News] Revision of QB/T 5365 for Air-Purifier Filters Officially Launched")
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Company Phone: 010-60770969
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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
