KL-AIR Group has been specialized in the gas purification industry for decades, operating various types of products such as cold dryers, suction dryers, filters, nitrogen generators, oxygen generators, industrial chillers, blowers, etc. Its sales network of multiple physical companies is spread throughout the country. Hangzhou Kelin Gas Source Equipment Co., Ltd. is a wholly-owned subsidiary of KL-AIR Group. It was developed in cooperation with multiple domestic and foreign research institutions in 2013 and officially promoted to the market in 2019. KL-AIR company has cooperated with multiple large and famous film production enterprises around the world, and jointly developed with well-known domestic colleges and universities to establish comprehensive production inspection and testing laboratories. Currently, KL film has been applied in more than 30 countries around the world. KL Company is a sales company of KL-AIR Company, currently responsible for comprehensively promoting the market development and application of membrane separation products, and focusing on utilizing membrane technology for energy conservation and emission reduction, providing good solutions for technological transformation and upgrading, so as to better utilize and promote this high-tech.