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中文
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How Does a CR Box Help Reduce Infection Risk?
A CR Box draws room air through four filters and exhausts cleaned air through a top fan, reducing airborne viral load and improving circulation as one layer of protection.
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What Is a CR Box, and Can It Really Help Prevent Infection?
The Corsi-Rosenthal Box combines a box fan with four or five MERV filters. It was created to improve ventilation and reduce indoor viral loads at low cost.
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Does a CR Box Really Work?
CR Boxes use four filters and a top-mounted fan to clean and circulate indoor air. They are inexpensive and easy to build, but direct evidence of virus-blocking performance remains limited.
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Chehejia Secures Patent for an Air Filter, Air Suspension System and Vehicle
Beijing Chehejia has patented an air filter with two silencing chambers and a Helmholtz resonator design that reduces airflow noise in a vehicle air-suspension system.
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FAW Jiefang Secures Air-Filter Maintenance Reminder Patent
FAW Jiefang's patent determines air-filter maintenance timing from real-time intake pressure, simplifying processing while helping prevent excess fuel use and noncompliant emissions.
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Differences Between Pleating Glass-Fiber and Melt-Blown Filter Media
Glass-fiber filter paper offers high airflow, low resistance and strong dust capacity but is fragile. PP melt-blown media is easier to manufacture and uses different pleating equipment.
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Dust-Holding Capacity Testing for Air Filters Under ISO 16890
ISO 16890 classifies filters into four efficiency groups. Its dust-loading test uses Arizona road dust to evaluate capacity, an important indicator of filter service life.
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Definitions of Filter Efficiency and Common Filter Specifications
Filter-efficiency labels differ across European, American, international and Chinese systems. A rating is meaningful only when its test method and classification are understood.
Company landline
010-60770969
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 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
