As a professional filter manufacturer, GRF (Guangzhou GRF Railway Locomotive Fittings Works Co., Ltd.) was founded in 1998, with an area of about 19,000 square meters of workshop in Guangzhou Overseas Chinese Industrial Park of Science and Technology beside the new Bai Yun airport. We devoted the principle of Pursue perfect quality, Exceed Technology Boundary and will continue to generate the competitive products to meet our customers customized demand. We had got CRCC Certificate, Intake Air Filter Practical Innovation Patents and involved in drafting Chinese Railway Standards for more than 10 years.