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KOPU filter media
Developed by 4G , KOPU is air filter media for manufacturing pocket filters used in general ventilation. In KOPU medi...
TRAD filter media
To meet customers needs, 4G manufactures traditional fiberglass media for ventilation bag filers. Compared with simil...
HESY filter media
In manufacturing bag filters, a special designed stitching machine is needed. To help customers who do not have...

About us

    4G is a manufacturer of air filtration media. 4Gs media are used primarily in making pocket filters for general ventilation. In January 2012, 4G was founded by Hunan Yunfang Filtration Tech. and Dutch Glass Works, B.V. Dr. J. Cai, who has been working in the filtration field for year......[More]

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