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About us

4G is a manufacturer of air filtration media.  4G’s 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 years, followed by a group of inexperienced youngsters, made pioneer triers for traditional fiberglass media.  A trail production started in June 2012.  In early 2013, 4G started mass production.
In June 2013, 4G introduced a new media KOPU.  These media include pre-filter layer of a synthetic on top of fiberglass.  With a strong per-filter layer, fiberglass is no longer fragile, i.e. operational friendly.
All technics and production lines were developed by 4G alone, though traditional fiberglass media were introduced 50 years ago by a US manufacturer.
4G’s Products: Media in making bag filters for general ventilation
TRAD, traditional fiberglass media.
KOPU, fiberglass media with a pre-filter layer.  Easy handling.
4G premises that we produce no filters, i.e. never competing with customers.
To help filter manufacturers who do not have a specially designed stitching machine, 4G can provide ready sewed filter bags.
4G is a newcomer in the business of filtration media.  It is fresh, young, unexperienced in business and company routines.  It will grow.  It will experience all.  It will bring the best products to meet customer’s needs.
Location
4G is located at Handan City, Hebei prov., China.  This is a historic town for more than 2000 years.  It is 420 km south Beijing, or two hours by a bullet train from Beijing.
城市内赚钱项目和农村赚钱项目